Kensington Pro Fit Ergo Mouse Wireless 2.4 GHz Bluetooth 4.0 GreyDescriptionSpecificationsShipping 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