Arch Shape for Ergonomic design.
		2 Way Data transmission.
		3 Key Buttons.
		1 Scrolling Wheel is for document and Web page reading.
		32 Channels in 2 Groups in hopping technology.
		Interface: USB 1.1 or 2.0
		Selectable High definition 800/1600dpi resolution.
		Sensor Type: Optical sensor.
		Use of a two AAA 1.5V battery.
		Dimensions: 113(L) x 58(W) x 39(H)
		Safety & Green : FCC / CE / Rohs
		Compatible with Windows 2000 / XP / VISTA / Windows 7.