With its split & 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 (2.4GHz and Bluetooth 4.0 LE) with 128-bit AES encryption quiet typing spill-proof keys F-keys for shortcuts caps lock numbers lock & 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 youre ready. Ergonomist-approved design Positions your hand for improved comfort. Split and sloped keyboard with adjustable reverse tilt Positions hands wrists and forearms for comfort and neutral alignment. Built-in wrist rest Supports cushions and cradles the wrists. Dual wireless with 128-bit AES encryption The flexibility of 2.4 GHz and Bluetooth 4.0 LE with government-grade encryption. Quiet keys For smooth easy non-disruptive typing. Spill-proof keys Make clean-up fast and easy. Replaceable receiver If your receiver is ever lost or damaged simply purchase a new one pair it with your mouse and youre ready. Three-mode power-saving switch Allows you to toggle between 2.4GHz Bluetooth and Off for best battery life. Caps lock numbers lock scroll lock and F-keys Popular features that make typing and navigating easier and more efficient.