wireless finger mouse,finger mouse,Light sensor, can be used on different types of pad, cloth, can used on knee pc accessory/mou Finger mouse(mini,usb,optical ... size, 1 / 3~4 / 1 weight of normal mouse; Wear it on finger; 800dbi, Support USB; Light sensor, can be used on ... System requirement: * windows me/2000/xp. Ibm pc compatibles. USB Finger Button Optical Mouse PC Laptop Ring Wheel