... Electric impact screwdriver & Electric precision screwdriverThe electric screwdriver use dc power supply, working voltage 24 v, have automatic decommissioning functions, namely ... Maintenance is unnecessary.* Easy to switch working.directly switching from power source.* The speed with HI/LO switch two adjustable period ... 6-2.06 802 Precision Torque Semi-Automatic Electric Screwdriver (power tool,drill)