- Optical Technology: Navigate with better speed, accuracy and reliabilitythe optical sensor tracks movement on nearly any surface without the hassle of clogged mouse parts. - Comfort in Either Hand: Familiar shape for right or left handed comfort. - Plug and Play: The simplicity of plug and play no software needed. Device interface: USB Buttons quantity: 2 Movement detection technology: Optical Package dimensions (WxDxH): 135 x 135 x 55 Plug and Play: Y Package weight: 200 Purpose: Office Recommended usage: - Scroll: Y Movement resolution: 1000 Compatible operating systems: Microsoft Windows XP, Vista, 7