Use 18650 battery, can be inverted,flashlight Irradiation of long - range, long duration night light tail cap Y1 flashlight onlyProduct description : 1.LED ... that need to pre-start time of trouble, at a range of 200 meters, light bulbs life of up to 100,000 hours or ... Two 18650 2400 mA batteries, bright light for at least 2 hours, 6 hours of medium light, low light for 20 hours; 4, Material ...