Zehui Set of 4 Flameless Colorful Color Changing Blow Sound Sensor Flicker LED Candle Tea light lamp Power supply: 3x button cell (installed), can operate for 48 hours continuously while LED can last up to 100,000 hours. Enjoy the ambiance of real candles without the hazard of fire at the flip of a switch or when you blow it out. 7-color changing automatically all the time, feels so cool so romantic! Great choice for mood lighting both indoors and outdoors. Flameless, smokeless, environmental friendly, safe to use.