C4 LED within a textured reflector provides good beam spread, along with a piercing hotspot for distance. C4 LED technology, impervious to shock with a 50,000 hour lifetime. Three 365 nm UV LEDs and three 390 nm UV LEDs, with a 100,000 hour lifetime. Mode selection switch: C4 LED high, C4 LED low, UV LEDs, and Safety. Safety mode prevents the light from coming on when you don’t want it to. Push-button tail switch facilitates one-handed operation for powering the light on/off. Runs 10 hours using UV LEDs. Powered by two 3V CR123A lithium batteries (included). Machined aluminum construction with non-slip knurled grip and a matte black anodized finish. IPX4/water-resistant. 1 meter impact resistance tested. Unbreakable polycarbonate lens. 5.40 in. (13.7 cm). 5.44 oz (152 grams). Limited lifetime warranty.