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 security delivers the flexibility of 2.4 GHz and Bluetooth 4.0 LE, with government-grade encryption. Quiet keys means typing is smooth, easy, and non-disruptive. Spill-proof keys make cleanup fast and easy. With a replaceable receiver, if your receiver is ever lost or damaged, simply purchase a new one, pair it with your mouse, and you're all set. 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 are popular features that make typing and navigating easier and more efficient.