Ergonomist-approved design positions your hand for improved comfort. Spill-proof keys make cleanup fast and easy. Quiet keys means typing is non-disruptive. Split and sloped keyboard with adjustable reverse tilt positions hands, wrists, and forearms for comfort and neutral alignment. Built-in wrist rest. Dual wireless with 128-bit AES encryption security delivers the flexibility of 2.4 GHz and Bluetooth 4.0 LE, with government-grade encryption. USB connection. Caps Lock, Numbers Lock, Scroll Lock, and F-Keys are popular features that make typing and navigating easier and more efficient. 2 "AAA" batteries included. 3-year limited warranty. English. Black.