Solar Powerd : This solar light bulb can collect the solar energy by solar panel. In daytime when there is sunshine, connect the solar panel to the light bulb by usb calbe, the solar panel convert the solar energy to electric energy and store it in the battery of light bulb. Then when you power on the bulb,it will keep light on. Two Way Charge: The light bulb can be charged by the solar panel or DC 5V adaptor by USB cable, it can keep lighting for 4-6 hours after fully charged.LED lifespan is 50000H. When charging by solar panel: please put the solar panel outside under the sun and keep the solar panel facing the sunshine directly.At the same time connect the bulb with cord to the bulb for 5-8 hours, charging indicator is red when charging, full charged still red.(5-8V power adaptor for charging as well) . Application in Many Case: Ideal for home,camping, cooking, working, reading, shed, chiken coops, emergency and blackouts,etc.Polite Note: The bulb is not waterproof.The solar panel it rainproof. Easy to install and control:Fixed the solar panel in the outdoor with sufficient sunlight, and introduced the calbe into a room to connect the solar panel to light bulb.The remote control distance about 5m,it is convenient and flexible to contol the bulb power on/off etc. Portable: With rechargable battery,the bulb can be used as moving light,It is energy saving, It is good helper for mountaineering, traveling, and expedition.