) Operated by Ni-Mh sealed storage battery, free-maintenance, high power, long life, light weight, no leakage, non-pollution, safty and reliability. 2) Using LED bulb, no heat, low consumption, high lighting efficiency, long life(up to 20,000 hours). 3) Two different brightness LEDs for option via conversion the switch. The lighting time of accessory light is up to 35 hours. 4) Free of maintenance during guarantee using period. 5) Excellent color vision under mine, strong penatrability in the environment of dust and fog. 6) Short circuit protection design make sure to cut the power within 15ms when short circuit occurs. 7) More comfortable, environmental protection. It weights 500g, only 1/6 as lead-acid miner lamp. Portable, flexible, non-pollution. 8) Packing: 1 pc/ box, box size: 135*100*120 mm.