* Mouse Dimension: 9.0x 5.2x 3.5cm

* 27MHZ-RF Radio Frequency technology

* 1 channel 256 ID to avoid interference

* Operating distance: 1.0- 1.5 Meter

* Key number: 3 Keys (wheel button on middle button)

* Battery: 2 x AAA ( Alkaline )

* Operation System: Win 98SE, ME, 2000, XP, Vista

* Comfortable rubber mat on two sides