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