Optical sensor technology - Blue Trace technology combines the power of optical technology with the precision of laser for remarkable tracking on almost any surface including wood, granite and carpet Dual-purpose design - Large enough for comfortable desk use, yet small enough for the mobile user Ergonomic - Ergonomic shape provides support to help prevent palm strain; designed for left and right handed users Self storing adapter - Wireless receiver stores in mouse so its never lost and always ready to use The Targus Blue Trace Wireless Mouse, features the latest Blue Trace technology for accurate and precise tracking. Blue Trace technology combines the power of optical technology with the precision of laser technology for remarkable tracking on almost any surface including wood, granite and carpet. The ergonomic design reduces wrist strain for comfort and the mouse is ambidextrous for both left and right handed users. The Micro USB receiver can remain permanently in the USB port for