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. Wired/Wireless: Wireless; Maximum Wireless Range: 33 ft; Connector/Port/Interface: Bluetooth™; USB; Keyboard Design: Ergonomic.