97670 Color: Graphite Features: -Optical mouse.-Sleek design of the mouse offers a smooth, contoured comfort grip for your right or left hand.-Plug in nano receiver and wireless.-Nano Slot convenient nano receiver storage for when you need it..-Receiver also slides right into the bottom of the mouse for safekeeping.-Programmable roller button assign favorite features to the roller and make work easier.-Fit easily in work totes, backpacks or even handbags.-Receiver can be stored inside the battery compartment for safekeeping.-Interface: USB 2.0 (also compatible with USB 1.1 ports).-Operating system: Windows XP, 2000, Vista, Mac OS 10.4.X and higher.-Contents: Mouse, nano receiver and 2 x AAA batteries. Specifications: -2.4GHz Reliability and performance.