(1) Super bright The main light LED of LED Miner Head Lamp Mining Lighting Underground Cap Lamp is American CREE XPG LED, which can gives more than 150 lumens output, and the lighting degree is 20,000 lux in full lighting time (tested with 1 meter away from the lamp head) .The full charged G5 will provide more than 15 hours continuous lighting. (2) Short-circuit protection Contained in a sealed battery case, the product has a short-circuit protection, mining led cap lamp and anti-static housing which makes it explosion proof, waterproof and dust-proof. (3) Over-charge and over-discharge protection system The durable Li-ion battery has an over-charge and over-discharge protection system to protect the battery from over charge or over discharge. And the charger has precondition charging to prevent the battery damaged with high current when the battery voltage is too low. The cap lamp is suitable for operation under harsh mining conditions. (4) Portability Small in size, light in weight, ergonomically designed, maintenance free, simple charging, easy operation. The mining led cap lamp has received praise from many miners and major mining companies. (5) Environmental 20000lux undergound mine lamp safety mining helmet light led miner lamp is made from environmentally friendly Li-ion battery and other non hazardous materials.G5 is an environmentally friendly product as per ROHS Directive.