SureFire HL1-A-TN Tan Tactical Helmet Light / Military Helmet Mount Flashlight Made of durable glass-filled nylon polymer and neoprene O-ring sealed, watertight body; White and blue LEDs and infrared IFF LED beacon Two toggle switches and a pressure switch for total control Long runtime from a single 123A battery with 10-year shelf life Easily removable for servicing or transfer to other helmets