High Efficiency: Our portable electric screwdriver has a large non-load rotation speed of 250r/min and 3N.m of torque, which increases the screw installing and unscrewing efficiency. Built-In LED Light: LED lights to illuminate dark places. The LED work light will be on at the same time when the screwdriver is on. It automatically turns off after 30 seconds if the screwdriver is not used. The function of non-contact electric testing, safe and convenient. USB Rechargeable: electric screwdriver set with bits is powered by a 2000mah rechargeable lithium battery, and it can be recharged anywhere with the usb port . Cut: 177x35mm/6.97x1.38inch. Safety Warning: This cordless screwdriver can measure electricity in the wall, if electricity is detected, a red light will turn on here and a beep sound . Wide Application: It suitable for some small appliances and light work, like repairing circuit, repairing bicycle, electrical maintenance, installing switch, etc.