1st gear light can be used for 8 hour, 2nd gear is weak light can used for 15 hours. in overcharge discharge protection circuit. What's in the box? 1 x 100W LED Emergency Extra Brightness Wireless Rechargeable Light Bulb Charging Outdoor Camping Camping Tent Lamp Night Market Bulb 1x charger Features: Type : Led ! High quality ! Watt : 200W Full charge in 12 hour Include charger. Safety to use ! Extra brightness ! 12000 math lithium battery -Long life, up to 500 Times above recycling use -Led lamp power consumption is low, lighting time is long,