Backup light with built in NiMH rechargeable battery with a capacity of 500mAh and 10 ULTRABRIGHT LED’s. Can be used at a normal E27 base. The lamp will be charged automatically as long as there is mains. If the mains voltage disappears the lamp will start to burn for approximately 6 hours. The charge function is indicated with a LED. There is a test button to check the function of the bulb. The lamp can be used as a torch too, because it has an on/off switch. Please note that the lamp doesn`t burn as long as there is mains voltage; only by pressing the test button.