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Ergonomic Keyboards
The ergonomic keyboards offer features that enhance productivity by allowing the wrists to be in more natural positions, resulting in a more comfortable user during longer periods of usage. Most of these models split the keyboard into two sections and angle the keys for a more ergonomic design. User can set the location and angle of each half. This feature is beneficial to physically impaired individuals who are unable to work with both hands in the same area. To provide more wrist support, most models include built-in wrist supports.
![[Ergonomic Keyboard]](ergokey.jpg)
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Small Keyboards
The small keyboards are intended for use by individuals who have limited range of motion or difficulty maneuvering. The keys are smaller and closer together and have been located to optimize space. Users select keys that require very little key travel with a hand-held wand or with a mouthstick. Small keyboards are also available with membrane keys. Membrane keys are smooth and flat and covered with a plastic lining, making the keyboard waterproof and easy to keep clean. Membrane keyboards also tend to be sturdier since the keys don't actually move when pressed.
![[Mini Keyboard]](minikeyboard.jpg)
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Large Keyboards
Individuals with visual difficulties or gross motor skills may prefer the larger keyboards to the standard size. The keys are larger and some offer auditory or tactile feedback. For users who drag their hands across the keyboard, some large keyboards have a built-in keyguard. An alternate method of reducing unintentional input is the "delay to accept" feature that is available with some keyboards. This feature requires a key to be held down for a preset time before it is accepted as input. Large keyboards are also available with membrane keys and membrane keyboards.
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One-Handed Keyboard
Users who can type with one hand have several keyboard options available. One-handed keyboards include the Maltron, Dvorak, the BAT and the Twiddler. The Dvorak and Maltron keyboards have a full set of keys, organized in a frequency of usage layout, while the other keyboards use key combinations to represent other keys. The BAT keyboard, designed for the left or right hand, has only seven keys that emulate the entire keyboard. A combination of keys ("key chording") represents the other keys of a standard keyboard. The Twiddler fits into the palm of the hand and has 12 finger keys and 6 thumb keys for key combinations.
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Software Aids for One-Handed/Monthstick Typists
There are several softwares that provide feature like shift key which one can press a shift key and then a letter without simultaneously pressing the two keys to obtain a capital letter. Some features include beep visual on-screen beep for deaf users or delay feature that allows one to delay the key repeat.
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