This is a new Insight M3X Tactical light that is designed for use with firearms with a picatinny or universal rail. This tactical illuminator has a selector switch that turns it constant on for manual use, or using the included jack, allows for momentary use. This unit produces 125+ lumens and is waterproof up to 66' for 2 hrs. It comes with remote jack, extra bulb and a plastic case. It is powered by 2 3V batteries.