Size(mm): 111?1?5mm Weight(kg): 0.0912kg Key-Press Life: 150Million Working Principle: WIRE optical Button: 7 DPI: 1000DPI Wheel 1 Scrolling Wheel Power Consumption: 5V/70mA Switch/MTBF: 70?0 gf/up to 1kk times Battery: AAA? Power Consumption: 3.0V DV/20mA Safe Certificate: CE,FCC,ROHS Easy Scrolling Under: Compatible with windows95,98,Me,NT 4.0,2000,XP Mac OS 8.5~9.X Color: black,gold,silver Connector: USB