802 Precision Torque Semi-Automatic Electric Screwdriver Suitable Screws: M2-M3.5 ... dc power supply, working voltage 24 v, have automatic decommissioning functions, namely and common screwdriver power can use ... can reach hundreds of thousands of times1.Fully Automatic,no carbon brush 2.Little noise,permanent life-time ... 6-2.06 802 Precision Torque Semi-Automatic Electric Screwdriver (power tool,drill)