These Bi-Color LED Blow On-Off Candles by Think Geek retain a bit of the nostalgia of real candles, but eliminate the fire hazard.
Made from solid wax, the candles utilize circuitry that allows you to choose the color of the flame (cool blue or warm yellow.) You can also blow the candle to turn it off, just like you would a normal one. However, the twist here is that you can blow on the candle to turn it on as well.
The candles operate on batteries (button battery for the 4” and AAA for the 6”.) They will “burn” for about 300 hours on a single set of batteries.