CX.Li B&N001 Ultrathin Silent 1600DPI Bluetooth V3.0 Wireless Mouse - Black (2 x AAA) Support desktop windows 7/XP/Vista etc. only if your computer connects bluetooth dongle. (bluetooth dongle not included) No USB receiver is needed if your computer possesses Bluetooth function. But if your computer does not have this function, please take a Bluetooth dongle first. (Bluetooth dongle is not included in this item.) Designed with a DPI key to adjust its operation speed (800dpi, 1200dpi, 1600dpi) 2 x AAA (not included)