YUEBO Aurora-I Industry's First Full Metal Mini Rechargeable 18500 Lithium-ion Battery Powered Electric Cordless Precision 150rpm Super Torque Screwdriver with 6 Different 1/8 Inch Hex Bits (Black) Industry's first full metal and no wire design portable mini electric screwdriver Five kinds of protection: over current protection, over voltage protection, over heat protection, reverse connection protection, electrostatic protection Use removable 18500 Li ion battery, charging 2 hours can be used for more than 300 minutes NdFeB motor with customized multi-stage planetary gear reducer, strong and powerful; Average torque: &gt;4kgf.cm; Locked rotor torque: &gt;6kgf.cm The Super-Torque drive applies more than 150 rpm through a single forward / reverse toggle rotation of the ring; It's great for handling tiny screws in tight spaces