LMJ-CN&reg; New CREE IR NVG Infrared LED 950nm Spare Bulb solarforce 6P G2 Ultrafire 501B 502B C1 Powered by: CR123A 3.6 x 2 or 18650 3.7v x 1 Operating voltage: 3.7V - 9V Durable aluminum reflector---Smooth ---Mirror like Size(mm): 26.5(Diameter) Full metal constructed