Solar Panel and USB Cable Charging:Built-in solar led lights with 3.7V 1500mAh rechargeable lithium battery, bulbs charged by solar panel or 5V DC Micro 5P USB plug, after fully charged, they will can be usedfor highlighting: 5 to 7 hours; Medium light: 11 a.m.-1 p.m.; Low light: 19-22 hours. How to charge with 7W solar panel: place the solar panel outside 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 indicator offull charge is green. 4 light modes and light sensor function: solar powered bulb with 4 modes: high 300LM/medium 150LM/low 75LM/SOS; How to enter light sensor mode: press the AUTO button on the remote control OR press 5 timesthe MODE button of the solar bulb, 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 turns on the bulb at night. High Brightness 20 LED Solar Light Bulb with Remote Timer: Dimmable Solar Powered LED Light Bulb with 20 High Brightness LEDs and 2835 High Quality LEDs; you can remotely set the hours 0.5/2/5/10 hours to automatically shut downcamping sunlight. In the daytime when the weather is good, connect the solar panel with the led bulb, The solar panel can convert solar energy into electric energy and store it in the solar led bulb battery. The charged bulb can be used as a mobile lighting lamp. Wide Application: The outdoor sunlight is ideal for indoor home lighting, reading, outdoor camping, hiking, fishing, cooking, working, car, shed, chicken coops, the barn, the breakdownspower outages, hurricanes, storms, emergencies and blackouts, etc.