The TetraMouse XS is a lip-, tongue-, chin- or mouth-operated mouse designed for individuals with spinal cord injury or upper extremity amputation or disability. It works with any computer or device (including AAC devices) that have a USB port and an operating system or internal firmware that can use a standard USB mouse as an input device. The TetraMouse XS features side-by-side joysticks that require little or no head movement using the lips, tongue or chin for smooth pointer movement. The joysticks provide all functions of a normal mouse including mouse pointer position control; cursor motion speed control; left, right, middle, 4th, 5th, 6th, 7th and 8th button clicking; built-in left and right click and hold for drag and drop or selection/resizing operations and scroll wheel functions. Users also can type using included onscreen virtual keyboard software. It offers up to four programmable speed setting profiles that can be changed, stored, and recalled by the user. The user settings are retained when a computer is turned off. This device connects to a computer or other host device with a USB connector via its built-in cable. A CD-ROM installation and user's guide with optional software and a printed manual are included. The TetraMouse XS's housing is is made of non-toxic, Earth-friendly, biodegradable PLA (Polylactic Acid) plastic. COMPATIBILITY: Works on any computer or device that uses a mouse via a USB port (up to 7 button and scroll functions on PC computers with Windows; up to 10 button and scroll functions on Apple Macintosh computers). OPTIONS: Articulated arm mounting system with choice of clamp; flange mount; cup-shaped knobs for tongue operation; variety of joystick knobs. POWER: From USB port; no batteries or power adapter needed. DIMENSIONS: Built-in USB connection cable is over 9 feet long. COLOR: A variety of color combinations are available. WARRANTY: 30-day money-back satisfaction guarantee (60-day guarantee optional); unconditional lifetime transferable parts and labor repair or replace warranty.