Battery backup bulb with 90 minutes of emergency back up power, can also be used as a flashlight. It's perfect for table lamps. Be prepared for storms and blackouts with the battery backup-powered Great Value LED 5 Watts Soft White Medium Base Bulb. It operates as a standard light bulb, but it will provide up to 90 minutes of back up power in the event of power loss. It will even operate as a flashlight when you place two fingers over the base and one finger on the base tip. By only using 5 watts of energy, this light bulb can last for 15,000 hours; 13 years of life, based on an average of 3 hours of use per day! Never get left in the dark with Great Value LED 5 Watts Soft White Medium Base Bulb.