With its split and sloped keyboard with adjustable reverse tilt and built-in wrist rest, the ergonomist-approved Pro fit Ergo wireless keyboard positions your hands for improved comfort. Features include dual wireless (2. 4 GHz and Bluetooth 4. 0 LE) with 128-bit AES encryption security; quiet typing; spill-proof keys; f-keys for shortcuts; caps lock, numbers lock, and scroll lock; A Three-mode power-saving switch; and a replaceable receiver in the event the receiver is lost or damaged, simply purchase a new one, pair it with your mouse, and you're all set.