Overview: Model: Ultrafire WF602 C Features a Cree P4 (WC) LED emitter 50~100 lumens brightness (manufacturer rated) Powered by 1 x 1.2V/1.5V AAA battery (sold separately) Voltage input range: 0.9V~1.5 V Single-mode twist on/off switch Regulated driver circuitry Continuous runtime: 3~4 hours (manufacturer rated) Glass lens with aluminum textured/OP