Solar Panel & USB Cable Charging: Solar LED lights built-in 3.7V 1500mAh rechargeable lithium battery, bulbs charged by solar panel or DC 5V Micro 5P USB plug, after fully charged, it can be used for highlight: 5-7 hours; Medium light: 11-13h; Low light: 19-22 hours. How to charge with 1.2W solar panel: Put the solar panel outdoors under sunlight and at the same time keep the bulb connected to the panel cable for 6-8 hours, the charging indicator is red, the full charge indicator is green. 4 Lighting Modes & Light Sensor Function: Solar powered bulb with 4 modes: high 300LM/medium 150LM/low 75LM/SOS; How to enter the light sensor mode: Press the AUTO button on the remote control OR press the MODE button on the solar bulb 5 times, the light sensor mode only worked when the solar panel was connected to the solar led bulb. Automatically turn off the solar lights and charge during the day; and automatically turn on the bulb at night. High Brightness 20 LED Solar Light Bulb with Remote