Color/Finish: Black Design Details: Ergonomic Design: Encourages A Natural Òhandshakeó Position. Reduces Strain On Wrist And Arm. Plug-And-Play Functionality: Single Nano Usb Receiver For Easy Setup. No Complicated Installation Required. Measures 3.98In X 3.23In X 0.1In Materials: Abs Imported Contents Of Set: Mouse Usb Connector (1 Aaa Battery Required, Not Included)