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 Replaceable receiver Three-mode power-saving switch allows you to toggle between 2.4GHz, Bluetooth and Off for best battery life Featuring caps lock, numbers lock, scroll lock and F-keys Spill-Proof Keys and Wipe Down Protection make cleanup fast and easy MIL-STD: MIL-STD-810H Method 504.3 Contamination by Fluids