GiftU corporate gift expert, provides customised USB drive business gift set, guaranteed imported chips, small order welcome, 10 days production 
Wireless frequency：2.405GHz-2.483Hz
Working distance：10meters
Interface：USB
Rating working voltage/current：5V/40mA
Resolution：1600DPI
Button life：5,000,000 times
Receiver：USB plug&play mini receiver
Power：Polymer li-battery 80mAh