This flashlight is extremely powerful and the brightest flashlight available with an integrated laser. It has a built in on/off switch and a detachable pressure switch. It is designed to mount on any standard weaver rail in a split of a second. This flashlight is designed for real firearms it can handle shocks and heavy punishment. Weight: 0.35 lbs Length: 3.75” Width: 1.65” Height: 1.6”