Large Solar Candles are suitable for outside use as they are waterproof and won’t melt, can withstand the rain and sunlight, also work great in cold environment. Flameless candles have a built-in light sensor, when the surrounding environment is bright, the candle is in the extinguished state; when the environment is dark, the light will come on; automatically turn on and off, without human operation, very convenient.Fake LED candles have a built-in solar charging panel, as long as placed in a sunny place(unshaded) , they will charge the built-in battery, long-term cycle use without extra battery. With 10-12 hours of sunlight per day, they will light longer and brighter. Each electric candle is equipped with a 1.2V AA rechargeable battery with 600 mAh large capacity(one is enough), which is very safe, stable and reliable when used with solar charging board. Please don't use ordinary batteries.