Logitech Cordless Optical Mouse USB Logitech 3-Button Wireless Optical Scroll Mouse General Features: Color: Black Wireless freedom 3-button design Scroll wheel (acts as third button) Precise optical technology Includes USB Receiver with USB to PS/2 adapter Operates on two (2) AA batteries (not included) Regulatory Approvals: FCC CE BSMI C-Tick GOST-R MIC WEEE