- Model: UltraFire?WF-502B (Cree R2)- Features a Cree XR-E R2-WC LED emitter- Powered by 1?x 18650 or?2 x?3.0V/3.6V CR123A batteries-?Maximim voltage input: 8.4V- Single-mode tail cap clicky switch- 250 lumens maximum brightness (manufacturer rated)- 1000mA current output digitally regulated driver circuitry (manufacturer rated)-?50?minutes estimated total runtime?(manufacturer rated)-?Coated glass?lens with aluminum textured/OP reflector                                                                                                                                Dimensions: 5.2 in x 1.26 in x 1.26 in<br />Weight: 4.06 oz