The Braille EDGE 40, model B40K, is a refreshable braille display with a braille keyboard and braille notetaker functions designed for use by individuals who are blind or have low vision. The unit's 40-cell braille display provides Braille representation of information from the screen of a computer or mobile device, and its Perkins-style keyboard allows Braille input to the same device. The unit has 2 four-way navigation keys and 8 function keys (Escape, Tab, Control, Alt, Shift, Insert, Windows and Applications). The unit also features basic Braille notetaker capabilities, with 7 applications (Notepad, Scheduler, Alarm, Clock, Calculator, Stop Watch, and Countdown Timer). An SD card slot supports cards with up to 32GB memory. The unit has USB and Bluetooth connections. It is compatible with several screen reader programs, including JAWS, Windows Eyes, SuperNova, NVDA, VoiceOver, Mobile Speak, and TALKS. The manufacturer offers free firmware updates for life. POWER: Uses rechargeable battery with 20 hours battery life. DIMENSIONS: 0.9 x 12.2 x 4 inches. WEIGHT: 1.73 pounds. WARRANTY/GUARANTEE: 2 Year manufacturer warranty.