Built-in rechargeable battery- It has the fastest rechargeable battery and ensures interrupted power supplies are manageable. Power backup of 4 hours- It can effortlessly run up to 4 hours. Just install it and forget about all interruptions. Best for unexpected power cuts- Sudden and frequent power cuts can cause a huge inconvenience in regular work. Emergency bulbs can act as an excellent backup for such scenarios. Can be used as a regular bulb- It resembles the regular conventional bulb and can be fitted into the socket for everyday usage.