The TLR-3 by Streamlight is a lightweight rail-mounted light designed to fit compact and sub-compact handguns. It also fits most full-sized handguns with rails on the market, and a key kit for mounting to a wide variety of weapons is included. The rail clamp is designed to rapidly attach/detach to/from the side of the weapon, and the one-handed snap-on and tighten interface keeps hands away from the muzzle when attaching/detaching. The TLR-3 features an ambidextrous momentary/steady on/off switch, and it is waterproof to one meter for 30 minutes.