RF Wireless Optical Mouse Wireless design extend your working distance Precise optical technology 256 changeable like IDs Support windows98/Me/2000 , XP Mac OS 8.5, 9.X support USB Features: 1) 27MHz radio frequency, single channel 2) With the optical technology, the motion can be detected on most surfaces, including wood, plastic, and paint 3) Auto smart sleep and wake-up function and lower working current 4) Operating range: 1.8m in normal environment 5) 800 dpi hardware resolution 6) Receiver can turned in 180 degree, it can prolong using life of receiver Specifications: 1) Optical sensor 2) Working current: 22mA 3) Tracking speed: 435mm/s 4) Working voltage: 3V 5) Switch life: 5 millions 6) Switch force: 60?.15g 7) Switch resistance: >100MΩ