These are standard A60 LED Bulbs which have a built-in battery which allows the light to burn for up to 4 hours in the event of a power failure.  The bulbs have integrated intelligence which allows them to distinguish between being turned off at the switch and a total power failure. The bulbs recharge when in normal use once power has been restored.  These bulbs will turn on (and off) at the switch even if the mains power is off.  The bulbs are available in two colour options; Warm White (WW – 2700K) and Cool White (CW – 4700K). 

These bulbs come with a 2 year Warranty.