HP stands for high-powered. The TLR-1 HP series produce a long-range targeting beam that reaches 400+ meters!- C4 LED technology, impervious to shock with a 50,000 hour lifetime- 46,000 candela peak beam intensity; 200 lumens; runs 1.75 hours- Mounts directly to all MIL-STD-1913 (Picatinny) rails and weapons with Glock-style rails- Includes rail locating keys for mounting to a variety of rails and lithium batteries- Standard door switch- Standard Switch: Ambidextrous momentary/steady On-Off- Tethered battery door and latch mechanism prevents battery door loss while providing easy battery replacement- One handed snap-on and tighten interface keeps hands away from muzzle when attaching/detaching- Extensively live-fire tested impact resistant construction- Deep dish parabolic reflector produces long-range targeting beam with optimum peripheral illumination- Powered by two 3V CR123A lithium batteries (included)- Durable anodized aluminum construction- Unbreakable polycarbonate lens with scratch-resistant coating- IPX7; waterproof to 1 meter for 30 minutes- Operating temperature: -40F to +120F- Serialized for positive identification- Length with standard switch: 4.83 in. (12.27 cm)- Length with remote switch: 5.25 in (13.34 cm)- 5.3 oz (150.3 grams) with standard switch and batteries- 5.6 oz (158.8 grams) with remote switch and batteries- Limited lifetime warranty