Very convenient principle: no flame, good effect of real candle, robustness, ignition and rapid extinction through télécommande.Un more: the speed of delivery and spare lithium batteries! You still have to know that the range of the remote is not at all that of a remote control device, for example (you have to move); the minutes of each candle is lower than that of a candle in a chapel, so we had better buy, especially for outdoor use, several sets of "candles" - without expecting to see their BY light: it is their light that shows.
