EFK-II Supply AC 110V Universal Electric Screwdriver 800 Torque Repair Kit DC Power Supply 10 Bits Fit 4mm Bit Semi-Auto Electric Screwdriver with Drills is designed for quick, convenient screw removal. Ideal for home improvement projects and the assembly or disassembly of furniture, toys, digital devices, electronic appliances and much more. Utilizing top-grade motor, it tightens screws in a highly efficient and accurate way. Quiet, durable for long-lasting usage. ***120-day manufacturer warranty and buyer have to pay for shipping cost if send back for repair.