WORK EFFICIENTLY: Contains a 3.2V, 1000mAh rechargeable battery and a premium solar panel. Charge 6-8 hours in the sunlight and enjoy at night for 8-10 hours LIGHT SENSOR SWITCH: The solar built-in light sensor makes it light up at night or in dark environments and automatically turns off during the day. Turn on the switch before use. If the solar panel you received is not working, try charging it first