Dual-power precision screwdriver – a safe, efficient, compact tool. The dual-power precision screwdriver uses the international C4 electric standard speed of 100rpmand can be screwdrivers faster than manually. The entire dual-power precision screwdriver is small and easy to use like a pen, making it easy to navigate even if it’s not professional. With just one click, the screw head turns immediately. Features 18 of the most commonly used batch heads for easy fitting of different screws.