More Than Just Ordinary BulbsRechargeable Bulbs work like normal A19 LED battery bulbs and can be charging for daily use. A Must-have Family Survival ToolA necessity during blackout, storm, hurricane ect. To get prepared for emergency with this light bulbs with battery. Say goodbye to emergency candles that are not safe to use. You can replace your current bulb in any room, storage, basement, hallway, barn etc. Multi-FunctionThree use ways. 1. Use as normal bulbs on daily. 2. Use with portable power cap, ideal use for outdoor activity like camping light bulb, reading under the covers. 3. Work as a portable flashlight during power outages. Energy Efficient Light BulbsLED light bulbs with battery are equivalent to 60W ordinary light bulbs. Save at least 80% electricity bill, low energy consumption cost, no radiation, save 80% electricity bill, 100% environmental protection