Blue Trace technology combines the power of optical technology and the precision of laser technology for remarkable tracking on almost any surface including wood, granite, glass and carpet Design - small, compact design is perfect when space is limited - on an airplane tray, desk or in the office Optical Sensor Technology - the latest optical sensor technology ensures a quick and accurate response to mouse movements Ease of Use - avoid extra cable cluttering your workspace by adjusting the retractable cord to the desired length Cable Length: 76cm; Resolution 1000 dpi