Permanently stamped serial number for registration and identification. O-ring sealed throughout. High intensity halogen lamp (50-hour rating). 51,700 Peak Beam Candlepower. 5-Cell (1/2-D) Nickel-Cadmium battery pack. Rechargeable up to 1000 times. Highly polished metallic reflector withstands extreme temperatures & delivers superior optics. Adjustable light beam (Spot to Flood). Recessed, pushbutton, self-cleaning, 3-position switch. Rugged, machined aluminum construction with knurled design. Anodized inside and out for improved corrosion resistance. Water and shock resistant.