The Wiha Tools electric screwdrivers or powered screwdrivers offer the user the ability to quickly and efficiently complete screw tightening or loosening tasks without much manual input. Most electric screwdrivers will have torque settings, which can be used to prevent damage to the screw or object/material that it's being inserted into. This screwdrivers is exclusively intended for fastening and tightening metric screws in pre-drilled materials or to remove the screws and loosen them. Rated voltage/capacity 3.7/1.5 V/Ah Number of battery cells 1