- UltraFire WF-501B shell casing- 3W high powered UV LED light- 395~400nm wavelength- Powered by 1?x 18650 or 2 x 3.0V/3.6V CR123A batteries- Power input voltage: 3.6V~18V- Single-mode tailcap clicky switch- Regulated driver circuitry- 1000mA circuit current output- Coated glass lens with aluminum textured/OP reflector                                                                                                                                Dimensions: 5.31 in x 1.18 in x 1.18 in<br />Weight: 3.53 oz