The newest computer lock Safety Guard Mouse USB Optical Mouse, with wireless controller working within 1.5 meters. PC system will be locked automatically; and when you come back, USB Mouse auto-unlocks and keeps working! Optical Mouse: Smooth, precise, easy to use wheel for scrolling and fits for both left and right hand Wireless key ring can be hanged on your belt, very convenient. Crystal plastic design that you can see the inside device vividely. Computer Auto Lock / Unlock USB Computer Optical Mouse is good for use in govement offices, customs, courts, hospitals, finance, telecom, statistics, banks, insurance companies, national defence, science and technology reseach and electron commerce etc. USB 1.1/2.0 compliant Optical Mouse is compatible with: Windows 98/ME/SE/2000/XP/VISTA (98 needs driver) USB Optical Mouse Cable Length: ~150cm long; Size of the Computer Mouse: 9.5x5.5x2.8cm (L*W*D) Weight: 144g