This is a very special and intelligent LED bulb, when you use it daily, the rechargeable battery inside will be charged, when suddenly blackout, the bulb will still work. - When there is electricity in your socket, it is a normal LED bulb, when blackout, it will be a emergency bulb keep working. - Electrostatic induction switch, the bulb will be automatically re-start after 1sec blackout, you can also touch it to start like the picture show. - Electrostatic induction switch, If you want to turn off emergency lighting, you only need turn off the switch of your socket just like turn off a normal bulb, . - The battery can support working about 2-3 hours. (brightness will decrease automatically to lengthen working hours.) Usage: Emergency Light Certification: UL,CE,FCC,RoHS,CCC Is Batteries Required: Yes Power Source: AC Is Batteries Included: Yes Body Material: ABS Features: low heat generating, besides saving light power, Energy-saving Is Bulbs Included: Yes Is Dimmable: No Light Source: Incandescent Bulbs Voltage: 85V-265V Base Type:B 22 Color Temperature:55 00K-7000K Battery Duration: 2-3hours