20-Bit Electric Precision Screwdriver Set - Portable Cordless Magnetic Bit Driver This cord-less screwdriver is the ideal tool to dismantle and reassemble electronic devices during repairs. The battery powered driver set includes a precision electric screwdriver ( 2 x AAA batteries included), 20 micro bits, and a magnetizer/demagnetizer, housed in a durable soft carrying case. The bits included have been specially selected for compatibility with most major brands of smartphones, tablets and laptops including but not limited to Apple iPhones, iPads, Macbooks, Samsung Galaxy, HP and Acer Chromebooks, Lenovo ThinkPads. Features A built-in LED work light illuminates the area that the driver is operating in, ensuring you can clearly see shadowless details, regardless of the lighting in your repair area. The included magnetizer/demagnetizer gives you the option to magnetize the driver to ensure screws are easy to install/remove without losing them. Plus, the head can be demagnetized for IT repairs on devices that may be sensitive to magnets. Quick changing batteries ensure uninterrupted operation. Specifications Color: Silver. Power Supply: 2x AAA Batteries ( included). Speed: 110 RPM. Output Torque: 0.25 - 0.35 N.m. Supported Bit Size: 4 mm. Included Bit Size: H4 x 28 mm. Product Height: 0.6 in.. Product Length: 7.1 in. 18.0 cm. Weight: 0.55 lbs.