Portable electric screwdr / Portable electric screwdriver

Which is a portable electric screwdriver models can automatically remove the screws and screwdriver fixed depth. It is a tool to work in charging mode. Rear entrance screwdriver is charged to provide electrical power when working from the reservoir into the motor, driven by the motor shaft rotates, the screw fixed or removed. This reduces the tedious process of twisting the screw when rotating.When the power is not the way to achieve the best fixed state, he could be like a screwdriver as usual to continue fixed depth.