The scope of use of this type of precision electric screwdriver: for individual users: DIY or disassemble or repair mobile phone digital flat glasses camera notebooks and other electronic digital products. For these small and medium size equipment. Not suitable for dismantling large size equipment screws, the design purpose is very clear. (In addition, some of the equipment screws are tightened in the initial state of drunkenness and the screw is in a moment of rushing. It requires a very large torque, you can hold down the electric button and manually operate the screwdriver at the same time). The original design idea: the design of a portable compact precision electric screwdriver, you can disassemble the usual mobile digital electronics and other small and medium size equipment screws, because these devices screw itself is small. The smaller the screws, the less force is tolerated. If the speed is too fast and the force is too great, it can easily lead to slipping. Therefore, the traditional plug-in screwdrivers and pistol-type electric screwdrivers are not suitable for the demolition of these small and medium-sized precision equipment, excessive intensity, too fast, it is easy to cause the screw to slide the screw or breakdown circuit board. Disassembly of these small and medium size precision equipment, safety is more important, and this is the speed is 1 minute / 150 speed, personal DIY efficiency is sufficient. And this size is very portable design, very comfortable grip sense, operability is very strong, easy to carry. Package includes: 1 PC electric screwdriver (without battery) 20 PC batch heads 1 PC velvet bag