Features Ergonomist-Approved Design Positions your hand for improved comfort. Built-In Wrist Support and Neutral Grip Supports, cushions, and positions the wrist for comfort and neutral hand alignment. Quiet Clicking. The flexibility of 2.4 GHz and Bluetooth 4.0 LE, with government-grade encryption. Plug & Play USB Connection. For smooth, non-disruptive operation. Five Buttons (including forward and back). Enhance navigation and productivity. 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. Three DPI Settings (800/1200/1600) Let you dial in the sensitivity and precision of your mouse cursor. With its built-in wrist support and neutral grip, the ergonomist-approved Pro Fit® Ergo Wireless Mouse positions your hand for improved comfort. Features include dual wireless (2.4 GHz and Bluetooth 4.0 LE) with 128-bit AES encryption security, quiet clicking, five buttons (including forward and back), a replaceable receiver, a three-mode power-saving switch, and three DPI settings (800/1200/1600). In the event the receiver is lost or damaged, simply purchase a new one, pair it with your mouse, and you're all set. Ergonomist-approved design positions your hand for improved comfort. Built-in wrist rest and neutral grip supports, cushions, and positions the wrist for comfort and neutral hand alignment. 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 means mousing is smooth and non-disruptive. Five buttons (including forward and back) enhance navigation and productivity. Three-mode power-saving switch allows you to toggle between 2.4GHz, Bluetooth, and Off for best battery life. Three DPI settings (800/1200/1600) let you dial in the sensitivity and precision of your mouse cursor. Three DPI settings (800/1200/1600) let you dial in the sensitivity and precision of your mouse cursor.