The Leatherman Monarch 500 LED light is constructed of hard-anodized aluminum so it s as durable as stainless steel but only weights 3.5 ounces fitting easily in a pocket or belt system. The 500 provides a powerful 100 lumens that run on two common-size batteries (AA) and the machined reflector produces a clean light pattern for reading detail without causing eye-fatigue. Hey work is hard enough as it is; your equipment shouldn t make it harder. The Monarch 500 keeps it simple, strong and easy to store.