The ergonomist-approved Pro fit Ergo wireless keyboard positions your hands for improved comfort. A split and sloped keyboard with adjustable reverse tilt positions your hands, wrists, and forearms for comfort and neutral alignment. Its built-in wrist rest supports, cushions, and cradles the wrists. Dual wireless with 128-bit AES encryption delivers the flexibility of 2. 4 GHz and Bluetooth 4. 0 LE, with government-grade encryption. Keys are quiet and spill-proof, for smooth typing and easy cleanup. The receiver is replaceable, so if it's ever lost or damaged, simply purchase a new one, pair it with your mouse, and you're all set. A Three-mode power-saving switch enables best battery life, while popular features such as caps lock, numbers lock, scroll lock, and f-keys make typing more efficient.