9W LED Emergency Bulb provided to our customers, is a regular light bulb with a battery backup that charges when you turn the light on and then when you lose power the battery takes over to give you light. This bulb is widely used in case of emergency. You can easily use this bulb when the light is not there. 9W LED Emergency Bulbis highly in demand for its benefits and charging features. As you use this light, over the course of time the rechargeable LED bulb will begin charging an internal power source. This bulb is very economical and can be easily purchased by our customers at cheaper prices, in bulk quantities.