3.75” overall. Tailcap switch. TLR-1HL weapon mountable light. Also includes dual remote pressure switch, mounting clips, adhesive pads,and cable ties. Allows for simultaneous or individual activation of the Streamlight TLR-1 HL and accompanying external aiming device. Pressure switches permit momentary or constant on activation. Mounts directly to all MIL-STD-1913 (Picatinny) rails. Requires (1) Lithium battery . Aluminum construction. Color: Black. Boxed.