Wireless Optical Mouse Working RF Frequency : 27M HZ Compact wireless optical mouse with a small USB receiver. Convenient to carry, the USB receiver can be stored inside the mouse. Adopts advanced RF and optical orientation technology, high accuracy and reliability Symmetrical arc appearance Accepted ordinary batteries Super long working life One channel, six address codes, in an area of diameter 1.5m "Six remote-control mice can be used at the same time, and will not interfere with each other. -PS/2 & USB port available " Compatible with Windows 95/98/2000/NT/ME/XP Mouse Size: 85mm x 51mm x 30mm