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A speaker is an electro-acoustic transducer that converts electrical signals into sound loud enough to be heard at a distance.

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Voice recognition is a computer analysis of the human voice especially for the purposes of interpreting words and phrases identifying an individual voice.

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A muscle background is a device that can strap onto your arm. Its a prosthetic for people that's have lost limbs from explosions in the military buts its just only for veterans. With the gadget the patient is able to control a prosthetic arm when he thinks about it. The Myo Bands on the upper arm read the electrical impulses from muscle movement and wirelessly transmit he/she is trying to make and tells the prosthetic arm to complete the task.

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A Braille Keyboard is a special type of keyboard, usually featuring raised dots, that is used by visually impaired people to enter data into the computer. In contrast to the standard keyboard, Braille keyboards have a single key that represents each dot. To enter a single character into Braille keyboard, an individual presses a combination of keys at once. A Braille keyboard also includes a space bar just like standard keyboards. However, it is common to find blind people using the standard keyboard instead of the braille one. They do this after memorizing the keys on the standard keyboard . Braille keyboards are, however, very useful to newly blind individuals who may not have memorized the keys on the standard keyboard.

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Computer chairs can come differently between every type of chair. Some chairs are pricey, and some are cheap. A lot if chairs come with a back pillow to make you sit up straight when you work which will help your back if you sat down all day. You can also get special chairs that can move backwards so you can lay down on them, some even come with wheels on the bottom so you can move around easier.

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An on screen keyboard. Also known as a virtual keyboard is an on screen keyboard that is used with a mouse. An accessibility option for people with impairments, the keys are pressed by pointing to the key on screen and clicking the mouse. A keyboard displayed on a touchscreen. Also called a "soft keyboard," tapping the "virtual keys" with a stylus or finger is the same as pressing a real key on a keyboard. Contrast with physical keyboard.

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https://www.reference.com/technology/braille-keyboard-495192073ee12eec#
https://encyclopedia2.thefreedictionary.com/On-screen+keyboard
http://www.answers.com/Q/How_does_a_puff_suck_switch_work
http://www.answers.com/Q/What_is_speaker
https://www.bing.com/search?q=definition+of+voice+recognition&FORM=HDRSC1
https://www.bing.com/search?q=definition+of+predictive+text&qs=n&form=QBRE&sp=-1&pq=definition+of+predictive+text&sc=0-29&sk=&cvid=6B8650D0A72A459DBF99B884054AC225
https://www.bing.com/search?q=definition+of+camera+mouse&qs=n&form=QBRE&sp=-1&ghc=1&pq=definition+of+camera+mouse&sc=1-26&sk=&cvid=756420D0A4E7446FB77459C96AFE7F9E
https://www.engadget.com/2016/01/18/myo-wearable-controls-prosthetic-arm/?guccounter=1
https://www.bing.com/search?q=defenition+of+ease+of+access+computer&qs=n&form=QBRE&sp=-1&pq=defenition+of+ease+of+access+compute&sc=0-36&sk=&cvid=8E55C66081BA4D5CB11B8A877078625B

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Ease of Access Centre, formally utility Manager, is a component of windows NT family of operating systems that enables use of assistive technologies. Utility Manager is included with Windows 2000 and Windows XP

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Predictive text is when you are typing something and you are halfway through a word and it gives words that start the same so you can pick the one you were typing but it doesn't always get it right and you still have to type it out.

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A puff and suck switch is used to in many different things for example a wheelchair. It can be used to power the wheelchair on and off. It can also be used to activate switches so it can move and stop.

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A foot mouse can be used by a person who has limited or no use of their hands or arms. The foot mouse can be used to navigate through software programs and select things in much the same way as a standard mouse. Most foot mice consist of two segments. One segment will be used to control the cursor, the second segment is used to click the mouse or to select shortcuts. Most foot mice include straps that help to hold the device in place on the foot during use. A long cable runs from the mouse and plugs into the computer via a USB.