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Computer hardware
Computer hardware includes the physical parts or components of a computer, such as the central processing unit, monitor, keyboard, computer data storage

View Wikipedia Article

PDP-11 CPU board

Computer hardware includes the physical parts or components of a computer, such as the central processing unit, monitor, keyboard, computer data storage, graphic card, sound card, speakers and motherboard.[1] By contrast, software is instructions that can be stored and run by hardware. Hardware is so-termed because it is "hard" or rigid with respect to changes or modifications; whereas software is "soft" because it can be easily updated or changed. Intermediate between software and hardware is "firmware", which is software that is strongly coupled to the particular hardware of a computer system and thus the most difficult to change but also among the most stable with respect to consistency of interface.

Hardware is directed by the software to execute any command or instruction. A combination of hardware and software forms a usable computing system.

Contents
  • 1 Von Neumann architecture
  • 2 Sales
  • 3 Types of computer systems
    • 3.1 Personal computer
      • 3.1.1 Case
      • 3.1.2 Power supply
      • 3.1.3 Motherboard
      • 3.1.4 Expansion cards
      • 3.1.5 Storage devices
        • 3.1.5.1 Fixed media
        • 3.1.5.2 Removable media
      • 3.1.6 Input and output peripherals
        • 3.1.6.1 Input
        • 3.1.6.2 Output device
    • 3.2 Mainframe computer
    • 3.3 Departmental computing
    • 3.4 Supercomputer
  • 4 Hardware upgrade
  • 5 Recycling
    • 5.1 Toxic computer components
    • 5.2 Environmental effects
    • 5.3 National services
  • 6 See also
  • 7 Sources
  • 8 External links
Von Neumann architecture Main article: Von Neumann architecture Von Neumann architecture scheme

The template for all modern computers is the Von Neumann architecture, detailed in a 1945 paper by Hungarian mathematician John von Neumann. This describes a design architecture for an electronic digital computer with subdivisions of a processing unit consisting of an arithmetic logic unit and processor registers, a control unit containing an instruction register and program counter, a memory to store both data and instructions, external mass storage, and input and output mechanisms.[2] The meaning of the term has evolved to mean a stored-program computer in which an instruction fetch and a data operation cannot occur at the same time because they share a common bus. This is referred to as the Von Neumann bottleneck and often limits the performance of the system.[3]

Sales

For the third consecutive year, U.S. business-to-business channel sales (sales through distributors and commercial resellers) increased, ending up in 2013 at nearly 6 percent at $61.7 billion. The growth was the fastest sales increase since the end of the recession. Sales growth accelerated in the second half of the year peaking in fourth quarter with a 6.9 percent increase over the fourth quarter of 2012.[4]

Types of computer systems Personal computer Basic hardware components of a modern personal computer, including a monitor, a motherboard, a CPU, a RAM, two expansion cards, a power supply, an optical disc drive, a hard disk drive, a keyboard and a mouse Inside a custom-built computer: power supply at the bottom has its own cooling fan

The personal computer, also known as the PC, is one of the most common types of computer due to its versatility and relatively low price. Laptops are generally very similar, although they may use lower-power or reduced size components, thus lower performance.

Case Main article: Computer case

The computer case encloses most of the components of the system. It provides mechanical support and protection for internal elements such as the motherboard, disk drives, and power supplies, and controls and directs the flow of cooling air over internal components. The case is also part of the system to control electromagnetic interference radiated by the computer, and protects internal parts from electrostatic discharge. Large tower cases provide extra internal space for multiple disk drives or other peripherals and usually stand on the floor, while desktop cases provide less expansion room. All-in-one style designs from Apple, namely the iMac, and similar types, include a video display built into the same case. Portable and laptop computers require cases that provide impact protection for the unit. A current development in laptop computers is a detachable keyboard, which allows the system to be configured as a touch-screen tablet. Hobbyists may decorate the cases with colored lights, paint, or other features, in an activity called case modding.

Power supply Main article: Power supply unit (computer)

A power supply unit (PSU) converts alternating current (AC) electric power to low-voltage DC power for the internal components of the computer. Laptops are capable of running from a built-in battery, normally for a period of hours.[5]

Motherboard Main article: Motherboard

The motherboard is the main component of a computer. It is a board with integrated circuitry that connects the other parts of the computer including the CPU, the RAM, the disk drives (CD, DVD, hard disk, or any others) as well as any peripherals connected via the ports or the expansion slots.

Components directly attached to or to part of the motherboard include:

  • The CPU (central processing unit), which performs most of the calculations which enable a computer to function, and is sometimes referred to as the brain of the computer. It is usually cooled by a heatsink and fan, or water-cooling system. Most newer CPUs include an on-die graphics processing unit (GPU). The clock speed of CPUs governs how fast it executes instructions, and is measured in GHz; typical values lie between 1 GHz and 5 GHz. Many modern computers have the option to overclock the CPU which enhances performance at the expense of greater thermal output and thus a need for improved cooling.
  • The chipset, which includes the north bridge, mediates communication between the CPU and the other components of the system, including main memory.
  • Random-access memory (RAM), which stores the code and data that are being actively accessed by the CPU. For example, when a web browser is opened on the computer it takes up memory; this is stored in the RAM until the web browser is closed. RAM usually comes on DIMMs in the sizes 2GB, 4GB, and 8GB, but can be much larger.
  • Read-only memory (ROM), which stores the BIOS that runs when the computer is powered on or otherwise begins execution, a process known as Bootstrapping, or "booting" or "booting up". The BIOS (Basic Input Output System) includes boot firmware and power management firmware. Newer motherboards use Unified Extensible Firmware Interface (UEFI) instead of BIOS.
  • Buses that connect the CPU to various internal components and to expand cards for graphics and sound.
  • The CMOS battery, which powers the memory for date and time in the BIOS chip. This battery is generally a watch battery.
  • The video card (also known as the graphics card), which processes computer graphics. More powerful graphics cards are better suited to handle strenuous tasks, such as playing intensive video games.
Expansion cards Main article: Expansion card

An expansion card in computing is a printed circuit board that can be inserted into an expansion slot of a computer motherboard or backplane to add functionality to a computer system via the expansion bus. Expansions cards can be used to obtain or expand on features not offered by the motherboard.

Storage devices Main article: Computer data storage

A storage device is any computing hardware and digital media that is used for storing, porting and extracting data files and objects. It can hold and store information both temporarily and permanently, and can be internal or external to a computer, server or any similar computing device. Data storage is a core function and fundamental component of computers.

Fixed media

Data is stored by a computer using a variety of media. Hard disk drives are found in virtually all older computers, due to their high capacity and low cost, but solid-state drives are faster and more power efficient, although currently more expensive than hard drives in terms of dollar per gigabyte,[6] so are often found in personal computers built post-2007.[7] Some systems may use a disk array controller for greater performance or reliability.

Removable media

To transfer data between computers, a USB flash drive or optical disc may be used. Their usefulness depends on being readable by other systems; the majority of machines have an optical disk drive, and virtually all have at least one USB port.

Input and output peripherals Main article: Peripheral

Input and output devices are typically housed externally to the main computer chassis. The following are either standard or very common to many computer systems.

Input

Input devices allow the user to enter information into the system, or control its operation. Most personal computers have a mouse and keyboard, but laptop systems typically use a touchpad instead of a mouse. Other input devices include webcams, microphones, joysticks, and image scanners.

Output device

Output devices display information in a human readable form. Such devices could include printers, speakers, monitors or a Braille embosser.

Mainframe computer Main article: Mainframe Computer

A mainframe computer is a much larger computer that typically fills a room and may cost many hundreds or thousands of times as much as a personal computer. They are designed to perform large numbers of calculations for governments and large enterprises.

An IBM System z9 mainframe Departmental computing Main article: Minicomputer

In the 1960s and 1970s, more and more departments started to use cheaper and dedicated systems for specific purposes like process control and laboratory automation.

Supercomputer Main article: Supercomputer

A supercomputer is superficially similar to a mainframe, but is instead intended for extremely demanding computational tasks. As of June 2016[update], the fastest supercomputer in the world is the Sunway TaihuLight, in Jiangsu, China.[8]

The term supercomputer does not refer to a specific technology. Rather it indicates the fastest computations available at any given time. In mid 2011, the fastest supercomputers boasted speeds exceeding one petaflop, or 1 quadrillion (10^15 or 1,000 trillion) floating point operations per second. Super computers are fast but extremely costly so they are generally used by large organizations to execute computationally demanding tasks involving large data sets. Super computers typically run military and scientific applications. Although they cost millions of dollars, they are also being used for commercial applications where huge amounts of data must be analyzed. For example, large banks employ supercomputers to calculate the risks and returns of various investment strategies, and healthcare organizations use them to analyze giant databases of patient data to determine optimal treatments for various diseases and problems incurring to the country.

Hardware upgrade

When using computer hardware, an upgrade means adding new hardware to a computer that improves its performance, adds capacity or new features. For example, a user could perform a hardware upgrade to replace the hard drive with a SSD to get a boost in performance or increase the amount of files that may be stored. Also, the user could increase the RAM so the computer may run more smoothly. The user could add a USB 3.0 expansion card in order to fully use USB 3.0 devices, or could upgrade the GPU for extra rendering power. Performing such hardware upgrades may be necessary for older computers to meet a programs' system requirements.

Recycling

Because computer parts contain hazardous materials, there is a growing movement to recycle old and outdated parts.[9] Computer hardware contain dangerous chemicals such as: lead, mercury, nickel, and cadmium. According to the EPA these e-wastes have a harmful effect on the environment unless they are disposed of properly. Making hardware requires energy, and recycling parts will reduce air pollution, water pollution, as well as greenhouse gas emissions.[10] Disposing unauthorized computer equipment is in fact illegal. Legislation makes it mandatory to recycle computers through the government approved facilities. Recycling a computer can be made easier by taking out certain reusable parts. For example, the RAM, DVD drive, the graphics card, hard drive or SSD, and other similar removable parts can be reused.

Toxic computer components

The central processing unit contains many toxic materials. It contains lead and chromium in the metal plates. Resistors, semi-conductors, infrared detectors, stabilizers, cables, and wires contain cadmium. The circuit boards in a computer contain mercury, and chromium.[11] When these types of materials, and chemicals are disposed improperly will become hazardous for the environment.

Environmental effects

According to the United States Environmental Protection Agency only around 15% of the e-waste actually is recycled. When e-waste byproducts leach into ground water, are burned, or get mishandled during recycling, it causes harm. Health problems associated with such toxins include impaired mental development, cancer, and damage to the lungs, liver, and kidneys.[12] That's why even wires have to be recycled. Different companies have different techniques to recycle a wire. The most popular one is the grinder that separates the copper wires from the plastic/rubber casing. When the processes is done there are two different piles left; one containing the copper powder, and the other containing plastic/rubber pieces.[13] Computer monitors, mice, and keyboards all have a similar way of being recycled. For example, first each of the parts are taken apart then all of the inner parts get separated and placed into its own bin.[14]

National services

Recycling a computer is made easier by a few of the national services, such as Dell and Apple. Both companies will take back the computer of their make or any other make. Otherwise a computer can be donated to Computer Aid International which is an organization that recycles and refurbishes old computers for hospitals, schools, universities, etc.[15]

See also
  • Information technology portal
  • Computer architecture
  • Electronic hardware
  • Glossary of computer hardware terms
  • History of computing hardware
  • List of computer hardware manufacturers
  • Open-source computing hardware
Sources
  1. ^ "Parts of computer". Microsoft. Archived from the original on 27 November 2013. Retrieved 5 December 2013. 
  2. ^ von Neumann, John (1945). "First Draft of a Report on the EDVAC" (PDF). Archived (PDF) from the original on 9 August 2013. 
  3. ^ Markgraf, Joey D. (2007). "The Von Neumann bottleneck". Archived from the original on 9 June 2011. Retrieved 24 August 2011. 
  4. ^ "US B2B Channel sales reach nearly $62 Billion in 2013, According to The NPD Group". NPD Group. 4 February 2014. Archived from the original on 8 August 2014. 
  5. ^ "How long should a laptop battery last?". Computer Hope. Archived from the original on 21 December 2013. Retrieved 9 December 2013. 
  6. ^ Domingo, Joel. "SSD vs. HDD: What's the Difference?". PCMag. Archived from the original on 19 March 2017. Retrieved 24 March 2017. 
  7. ^ Edwards, Benj. "Evolution of the Solid-State Drive". PCWorld. Archived from the original on 25 March 2017. Retrieved 24 March 2017. 
  8. ^ Alba, Davey. "China's Tianhe-2 Caps Top 10 Supercomputers". IEEE. Archived from the original on 11 December 2013. Retrieved 9 December 2013. 
  9. ^ "How to recycle your old computer". Digital Trends. 18 December 2016. Archived from the original on 17 April 2017. Retrieved 18 April 2017. 
  10. ^ Inc, Chris Keenan - Newtech Recycling. "Newtech Recycling Specializes in Computer Disposal, Laptop Disposal, Desktop Disposal Mainframe Disposal and Server Disposal". www.newtechrecycling.com. Archived from the original on 29 March 2017. Retrieved 18 April 2017. 
  11. ^ "The Toxic Components of Computers and Monitors". Archived from the original on 27 April 2017. Retrieved 26 April 2017. 
  12. ^ "What's Going On with Electronic Waste? – Electronics TakeBack Coalition". Archived from the original on 27 April 2017. Retrieved 26 April 2017. 
  13. ^ "Wire Recycling". All-Recycling-Facts.com. Archived from the original on 10 July 2017. Retrieved 5 May 2017. 
  14. ^ "Computer equipment recycling – Essential Guide". ComputerWeekly. Archived from the original on 21 December 2016. Retrieved 8 May 2017. 
  15. ^ Schofield, Jack (19 February 2015). "How can I safely recycle my old PCs?". The Guardian. ISSN 0261-3077. Archived from the original on 27 April 2017. Retrieved 26 April 2017. 
External links
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  • Learning materials related to Computer hardware at Wikiversity
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Basic computer componentsInput devices
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Output devices
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Samsung 860 EVO 1TB 2.5 Inch SATA III Internal SSD (MZ-76E1T0B/AM)
Samsung 860 EVO 1TB 2.5 Inch SATA III Internal SSD (MZ-76E1T0B/AM)
Samsung 860 EVO solid state drive is the SSD to trust. Based on 3D VNAND flash, Samsung offers enhanced read/write performance, endurance and power management efficiency. With multiple form factors, the 860 EVO is ideal for mainstream PCs and laptops.

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Acer Aspire E 15, 15.6" Full HD, 8th Gen Intel Core i3-8130U, 6GB RAM Memory, 1TB HDD, 8X DVD, E5-576-392H
Acer Aspire E 15, 15.6" Full HD, 8th Gen Intel Core i3-8130U, 6GB RAM Memory, 1TB HDD, 8X DVD, E5-576-392H
Acer Aspire E 15 E5-576-392H comes with these high level specs: 8th Generation Intel Core i3-8130U Processor 2.2GHz with Turbo Boost Technology up to 3.4GHz, Windows 10 Home, 15.6" Full HD (1920 x 1080) widescreen LED-backlit display, Intel UHD Graphics 620, 6GB Dual Channel Memory, 1TB 5400RPM SATA Hard Drive, 8X DVD Double-Layer Drive RW (M-DISC enabled), Secure Digital (SD) card reader, Acer True Harmony, Two Built-in Stereo Speakers, 802.11ac Wi-Fi featuring MU-MIMO technology (Dual-Band 2.4GHz and 5GHz), Bluetooth 4.1, HD Webcam (1280 x 720) supporting High Dynamic Range (HDR), 1 - USB 3.1 Type C Gen 1 port (up to 5 Gbps), 2 - USB 3.0 ports (one with power-off charging), 1 - USB 2.0 port, 1 - HDMI Port with HDCP support, 6-cell Li-Ion Battery (2800 mAh), Up to 13.5-hours Battery Life, 5.27 lbs. | 2.39 kg (system unit only) (NX.GRYAA.001).

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Logitech G502 Proteus Spectrum RGB Tunable Gaming Mouse, 12,000 DPI On-The-Fly DPI Shifting, Personalized Weight and Balance Tuning with (5) 3.6g Weights, 11 Programmable Buttons
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G502 features an advanced optical sensor for maximum tracking accuracy, customizable RGB lighting, custom game profiles, from 200 up to 12,000 DPI, and repositionable weights. Troubleshooting steps- • Unplug and re-plug the USB cable to ensure a good connection. • Try the mouse USB cable in another USB port on the computer. • Use only a powered USB port. • Try rebooting the computer. • If possible, test the mouse on another computer.

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Seagate Expansion 8TB Desktop External Hard Drive USB 3.0 (STEB8000100)
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The Seagate expansion desktop drive provides extra storage for your ever-growing collection of files. Instantly add space for more files, consolidate all of your files to a single location, or free up space on your computer's internal drive to help improve performance. Setup is straightforward; simply plug in the included power supply and USB cable, and you are ready to go. It is automatically recognized by the Windows operating system, so there is no software to install and nothing to configure. Saving files is easy too-just drag-and-drop. Take advantage of the fast data transfer speeds with the USB 3.0 interface by connecting to a SuperSpeed USB 3.0 port. USB 3.0 is backwards compatible with USB 2.0 for additional system compatibility. System requirements: Windows 7 or higherStorage space may vary slightly as : 7.27 TB . The hard drive is automatically recognised by the Windows operating system which does not require any software to install and nothing to configure

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G430 Surround Sound Gaming Headset delivers 7.1 Dolby Headset surround sound and crisp, clear chat, with comfortable cloth ear cups and a lightweight design.

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HyperX Cloud Stinger Gaming Headset for PC, Xbox One¹, PS4, Wii U (HX-HSCS-BK/NA)
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Logitech G602 Lag-Free Wireless Gaming Mouse – 11 Programmable Buttons, Up to 2500 DPI
Logitech G602 Lag-Free Wireless Gaming Mouse – 11 Programmable Buttons, Up to 2500 DPI
It's easy to be passionate about winning, but at Logitech, our passion is in the science that makes winning possible. We build precise gaming instruments. We advance technology so gamers can reach new levels of speed, precision, reliability and comfort. Science is our philosophy, our methodology for studying, testing, and advancing gamers' experience—in the lab and in the game. Learn more about Logitech G science. Features View larger Logitech G602 Wireless Gaming Mouse 250 hours of non-stop gaming. Your move. With up to 250 hours of battery life, G602 redefines the laws of wireless gaming. From the pinpoint accuracy of the exclusive Delta Zero sensor technology to the extra high durability primary switches, you can count on G602 to dominate boss after boss. Key Features Up to 250 hours of battery life1 Power-saving, high-accuracy Delta Zero sensor technology Lag-free gaming-grade wireless Performance and Endurance modes maximize battery life Long-life buttons rated to 20 million clicks 11 programmable buttons for customized game control2 On-the-fly adjustable DPI For Windows 8, Windows 7, Windows Vista, and Mac OS X 10.6.8 or higher Wireless Gaming Technology Cut the cord and get gaming freedom from cables, clutter, and game interference Experience zero delay between your thoughts and actions with gaming-grade 2.4GHz wireless and a 2-millisecond report rate Tiny USB Nano receiver can stay in your computer so your mouse is always ready for action View larger Programmable Controls Master your favorite games with 11 customizable controls Easily assign any keyboard keystroke or multi-command macro to any button with Logitech Gaming Software Control your game and mouse’s performance right out of the box with pre-configured button settings—no software required View larger Ultra-Durable Build G602 is built to handle torturous gaming conditions thanks to primary mechanical switches rated to a 20-million-click lifespan. Benchmark-Raising Battery Life With a battery that lasts up to 250 hours of non-stop gaming, you’ll never have to worry about your mouse holding you back. View larger Battery Life Indicator Never be surprised by low battery power again. The LED battery indicator warns you if the charge is running low. Delta Zero Sensor Technology Experience power-saving optimization and high-accuracy cursor control through exclusive lens design, illumination geometry, and processing algorithms View larger Performance/Endurance Switch Switch between Performance or Endurance modes to save power for when you need it most—in the game Get up to 250 hours of battery life in Performance mode or 1440 hours in Endurance mode. View larger Instant In-Game Sensitivity Switching Shift your DPI level with a single button press Record up to five DPI settings per profile— from pixel-precise targeting (250 DPI) to lightning-fast maneuvers (up to 2500 DPI) Programmable DPI switching buttons are strategically located next to the left click button for fast, accurate trigger-finger control Compatibility What's in the Box Mouse Wireless receiver Receiver extender cable 2 AA batteries, pre-installed User documentation System Requirements Windows 8, Windows 7or Windows Vista Mac OSX 10.6.8 or higher Powered USB port Internet connection and 100MB hard drive space (for optional software download) Gaming-Grade Specifications TRACKINGResolution: 250 – 2,500 dpiMax. acceleration: 20 G2 Max. speed: up to 2 meters/second (80ips)2 RESPONSIVENESSUSB data format: 16 bits/axisUSB report rate: Up to 500 reports/second GLIDEDynamic coefficient of friction – Mu (k): .093Static coefficient of friction – Mu (s): .143   DURABILITYButtons (Left/Right): 20 million clicksFeet: 250 kilometers BATTERY LIFE AND WIRELESSPerformance mode: up to 250 hours1Endurance mode: up to 1440 hours1Wireless range: 3 meters4 1 Battery life may vary based on user and computing conditions.2 Some profile settings require Logitech Gaming Software, available at logitech.com/downloads.3 Tested on wood-veneer desktop.4 Actual wireless range will vary with use, settings and environmental conditions. Choose the Logitech Gaming Mouse Right For You Good Better Best Logitech G100s Optical Gaming Mouse Logitech G400s Optical Gaming Mouse Logitech G602 Wireless Gaming Mouse Logitech G700s Rechargeable Gaming Mouse What Do You Get? Great value and control for MOBA/RTS games Full-featured performance for FPS games Enduring battery life and wireless freedom for PC games Wireless freedom and wired performance for MMORPG games Connection Choices Full-Speed USB Corded   Full-Speed Wireless     Mouse Design Maximum battery life     250 hours 12 hours Rechargeable Battery       Programmable Buttons: For single actions or intricate macros 4 8 11 13 Profile Storage:Store ready-to-play profiles       5 Navigation Features Sensor High-definition optical High-definition optical High-definition optical Laser Maximum Resolution: Higher means faster cursor speed 2500 dpi 4000 dpi 2500 dpi 8200 dpi Adjustable Sensitivity: Change dpi on the fly for pixel-precise targeting or lightning fast maneuvers Hyper-Fast Scrolling: Fly through long web pages       System Support Windows 8, Windows 7, Windows Vista Mac OS X 10.6.8 or higher       Check Out Other Logitech Gaming Gear Logitech G240 Cloth Gaming Mouse PadFor a mouse pad that boasts the best tracking precision and the ideal medium friction for low DPI gaming, pick up this mouse pad. Logitech G19s Gaming KeyboardThe G19s Gaming Keyboard features a GamePanel LCD screen and 12 programmable G-keys to take your game to higher levels with advanced technology to light your way forward. Logitech G510s Gaming KeyboardThe Logitech G510s Gaming Keyboard offers 18 programmable G-keys while the GamePanel LCD screen gives a view of vital stats. The G510s has everything you need for a clear advantage. Logitech G930 Wireless Gaming HeadsetThis gaming-grade wireless headset gives you a lag-free, interference-resistant connection, so nothing stands between you and victory. 7.1 surround sound powered by Dolby technology delivers a detailed, positional soundfield that lets you hear your opponents before they see you. Logitech G230 Stereo Gaming HeadsetUsing 40mm neodynmium drivers, the Logitech G230 delivers high quality stereo sound to keep you immersed in your game from start to finish. And the lightweight, comfortable design lets you play for hours.

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$36.99
-$43.00(-54%)


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