Much safer than real flame candles, and much more convenient than battery operated led candles, this pack of 4 realistic flickering flame tealights comes with its own charging station that plugs into a usb port. The candles have a 3.9cm diameter which is pretty standard for a regular wax candle, and are 2cm tall, plus 3cm for the flame, so they should fit in regular tealight holders, because of the realistic flame colour and flicker they even cast dancing shadows, just as a real candle would. Once fully charged these candles can last up to 60 hours. We tested the candles from 9am til 5pm for a few days and they lasted over 60 hours in total. Candles are 3.9cm diameter, 2cm tall 3cm flamefour tealight candles plus charging basesimple on off switch on base of each candleflame is a realistic flame colour and flickers like the real thingusb max output of 5v dc 2astation lights red whilst charging, changes to green when fully chargedcharging time 2 hourswill stay lit for up to 60 hours!do not leave to charge more than 5 hours use with a countdown timer if leaving for longer