The Streamlight TLR-3 LED Compact Rail Tactical Gun Mount Weaponlight delivers a bright 90 lumen light from a C4 LED at a compact size. The TLR-3 features an easy to use ambidextrous momentary/steady on-off switch that the operator can use with his shooting or supporting hand. It is powered with one 3 volt CR2 lithium battery and has a regulated runtime to provide constant high output light for up to 1.5 hours. It includes keys for all major rail systems for attachment.