The Kensington Pro Fit Ergonomic Wireless Mouse has 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).