Visenta iOne i1 Wireless 3D Egg Shape Cute Funny Portable Ergonomic Optical Usb Mouse (Black/Blue) Super mini USB receiver. 2.4G anti-interference AFH, wireless technology up to 15 meters Switch DPI by left+right keys, click & hold 3 seconds (500-1000-1500-1750 DPI) Simply plug and play - no driver required, compatible with Windows 7/Vista/2000/XP/Mac OS/Linux Power saving technology and automatic standby mode with wake option Size: 92 x 62 x 44mm. One AAA battery operated, can run up to 6 months per battery replacement