Features: 1)RF Wireless-Optical Mouse 2)Radio frequency 27MHZ,enjoy your freely wireless space 3)Adopts optical orientation technology, high accuracy & reliability 4)Super long working life 5)It has 256ID code, there is no interference even many mice being used at the sametime 6)The mini USB receiver can hiding on the back of the mouse. 7)Automatically save power sleeping functions. battery life be prolonged. 8)IBM PC and Win95/98/Me/2000/XP,No need driver88.6*47*32.5MM 9)Dimension: