The Streamlight ProTac Rail Mount HL-X Long Gun Light 88066 is a rail-mounted high intensity LED tactical light with TEN-TAP Programming that provides three different operating modes: high/strobe, high only, and low/high. Its durable aluminum construction with an impact-resistant tempered glass lens is IPX7 rated with the Standard button switch installed, and IPX4 rated with the Remote Pressure Switch installed. Easily attaches to MIL-STD-1913 (Picatinny) rails. Includes two CR123A lithium batteries.