Solar panel and USB cable charging: Built-in solar LED lights with 3.7V 1500mAh rechargeable lithium battery. Light bulbs charged by solar panel or 5V DC Micro 5P USB connector. After full charge, they can be used for up to 5 to 7 hours on high brightness, 11 to 13 hours on medium brightness, and 19 to 22 hours on low brightness. How to charge with a 7W solar panel: Place the solar panel outside in direct sunlight and keep the light bulb connected to the panel cable for 68 hours. The charging indicator is red; the full charge indicator is green. 4 light modes and light sensor function: Solar-powered bulb with 4 modes: high 300LM, medium 150LM, low 75LM, and SOS. To enter light sensor mode, press the AUTO button on the remote or press the MODE button 5 times on the solar lamp. Light sensor mode works only when the solar panel is connected. The light automatically turns off during the day to charge and turns on at night. 20 high-brightness LED light bulbs with remote timer: Dimmable solar-powered LED light with 20 high-brightness LEDs and 2835 high-quality LEDs. Remotely set the timer to turn off automatically after 0.5, 2, 5, or 10 hours. Ideal for camping and outdoor use. During daylight, connect the solar panel to the LED light. The solar panel converts sunlight into electrical energy and stores it in the lamps battery. The charged bulb can be used as a portable lighting source. Wide application: This outdoor solar light is ideal for indoor lighting, reading, camping, hiking, fishing, cooking, working, car use, sheds, chicken coops, barns, power outages, hurricanes, storms, and emergency situations.