The travel-sized mouse utilizes optical technology for superior precision control (800dpi versus predecessor at 400dpi). It's a compact, lighweight, three-button mouse, designed for ThinkPad customers who prefer a mobile mouse.
IBM Optical 3-button travel wheel mouse, 800dpi - PS/2 and USB for all ThinkPad models. Device interface: USB+PS/2, Movement detection technology: Optical, Movement resolution: 800 DPI. Colour of product: Black. Cable length: 1.2m. Mouse weight: 94g. Compatibility: IBM and IBM-compatible computers, Mouse dimensions (WxDxH): 54 x 96 x 32 mm