Ergonomist-approved design positions your hand for improved comfort Quiet clicking means typing and mousing is non-disruptive. Spill-proof keys make cleanup fast and easy. Five mouse buttons (including forward and back) enhance navigation and productivity. Split and sloped keyboard with adjustable reverse tilt positions hands, wrists, and forearms for comfort and neutral alignment. Built-in wrist rest. 2.4 GHz wireless technology. Dual wireless with 128-bit AES encryption security delivers the flexibility of 2.4 GHz and Bluetooth 4.0 LE, with government-grade encryption. English.