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 clicking makes for smooth and non-disruptive operation Built-in wrist rest and neutral grip supports, cushions and positions the wrist for comfort and neutral hand alignment Five buttons (including forward and back) enhance navigation and productivity Three DPI settings (800/1200/1600) let you dial in the sensitivity and precision of your mouse cursor.