With built-in wrist support and a neutral grip, the Pro Fit® Ergo wireless mouse, approved by ergonomists, holds your hand for improved comfort. Features include dual wireless (2.4 GHz and Bluetooth 4.0 LE) with 128-bit AES encryption security, silent clicking, five buttons (including forward and backward), an interchangeable receiver, a power-saving switch with three modes and three DPI settings.