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Description:1 features: 1.1 safety: All in a case with pc plastic material, make very good feature of explosion-proof, protection in electrical short-circuit, automatic power-off on the socket,100,000 hours le's life 1.2 reliability: The high strength case, optimized structure design and mcu control make the product more reliable 1.3 portability: Just a head lamp, small in size, light in weight, simple charging, easy usage 1.4 efficiency: More than 15hours working hours, more than 700lux after 15 hours, usage life 1000 cycles, display cap lamp number, time, battery capacity by 4 led digit,6pcs 5mm backup led's 1.5 environmental: Li-ion battery is free maintenance, and the material of li-ion is environmental, use 1w led to save power 1.6 economy: Three times longer than lead and acid cap lamp and saving in maintenance makes the product more compatible in price 2 major technical specifications: Features vt020 specifications Rated capability:4.5ah(li-ion battery) Rated voltage:3.7v Continuous discharging time:>15h Main light led working voltage:3.2v Main light led working current:0.35a Main light power:1w Main light luminous flux:>40lm Lamp lighting degree lighting degree at work:>700lux (distance in 1 mile) Main light usage life hour:30000h Weight: <210g Accessory light usage life hour:100000h Short circuit protect time: <15ms Usage duration of battery: (recharges) 1000 recharges (in reasonable working condition) Charging time: < 6 hours Charging voltage and current 4.5v@1a 3 operation procedure 3.1 main led and backup led on/off: Press right button one time, main led on, press lamp button again, main led off, press left button one time, backup led on, press lamp button again, back led off 4 charging: 4.1 charger input: Ac100-240v 50-60hz,0.3a 4.2 charger output: Dc 4.5v@1a 4.3 manufacturer provide charger to user, please use it only 4.4 when long-term storage is needed, charging should be done three months,50% charging capacity should be reached each time.