Led candles can be used indoors or out and will make a great feature due to the design of the candles they can be easily cleaned and used in hot and cold climates unlike wax which will melt in hot conditions or crack in temperatures less than 5c these candles can withstand the elementsr the candle is battery powered by 3 aaa batteries not included and has a cleaver auto onoff function switching the candle on for 4 hours and off for 20 it can also be turned on and off manuallyr auto