The Streamlight TLR-3 Tactical Weapon Mounted Light is an ultra-compact, lightweight weapon light that is big on power and brightness. The TLR-3 is great for just about any self-defense firearm with a Picatinny or Glock-style rail. The TLR-3 features a C4 LED that has an output of 170 lumens and will run for 1-1/2 continuous hours on a single CR2 battery (included). The light is waterproof to 1 meter for 30 minutes, and it is also shockproof and dustproof. To make installation simpler, the TLR-3 comes with 5 interchangeable keys which will allow the user to fit it to a wide variety of firearms.