... , automatic power-off on the socket , 100,000 hours LED’s Life1.2 Reliability: The high strength case , optimized ... .3 Portability: Just a head lamp , Small in size , light in weight , simple charging , easy usage1.4 Efficiency: more ... number , time , battery capacity by 4 LED digit , 6pcs 5mm backup LED’s1.5 Environmental: Li-ion battery is free ... resistant : 2 meters KJ3.5LM(A) 3.5Ah LED miner headlamp