Infogrip's BAT Keyboard is a one-handed, compact input device that replicates all the functions of a full-size keyboard, but with greater efficiency and convenience. The BAT is easy to learn and use. Letters, numbers, commands and macros are simple key combinations, "chords," that you can master in no time. Best of all the BAT's unique ergonomic design reduces hand strain and fatigue for greater comfort and productivity. The BAT is the ultimate typing solution for persons with physical or visual impairments and is proven to increase productivity when used with graphic or desktop publishing software.