Water & Wood Mini Cute 2.4G 1600DPI Wireless Optical Mouse/Mice Animals Tails For PC Laptop Notebook(Color Random) USB: USB 2.0 Operation systems: Windows 2000, Me, XP, Vista, Win 7 and Mac RF operation channel: 16, auto frequency hopping Power: 2pcs AAA battery (not included) Package Included: 1 x 2.4GHz Wireless Optical Mouse 1 x USB receiver