DURABILITY M10 tool are designed to be reliable and highly durable. That is why the LE-KEY has an aluminium body equipped with Nichia (Japan) 5mm LED, and is water-resistant (IPX4). CONVENIENCE & DESIGN At only 6.45cm long, the LE-KEY is easy to carry around. It is designed with grooves for better grip, Simply twist the head switch to use or turn it off. BATTERY Require 1xAAA alkaline battery. Lasts up to 10 hours of continuous usage.