Kohree&reg; 3W Cree Led Miner Head Lamp Cordless 3.7V 4.5Ah 18hours Lighting Time Explosion-proof with Display LCD & Light Control Key made of high engineering plastic ABS, with full sealing construction environmental-friendly Digital display function with lithium battery can know how long the lamp can be used and the time. Lighting time: &gt;18H (main illuminant); Illumination: &gt;4500Lx (start of lighting) LED current: 0.25A (main illuminant) 0.12A (the second illuminant), Battery life: &gt;500 time Amperage of charge: 0.4A (average); Ambient Temperature: -15~40 C