Navkar Crafts oating Tealight Candles Battery Operated, Water Activated Sensor LED Flameless Flickering Tea Lights Flameless, smokeless and long lasting, safe to use . No hot and dirty wax to deal with . Realistic light . Easy to use, simply let it float in water. the bottom twists off to replace battery . Main material: Plastic . Features: float in water, flameless ,high safety . Candle light touching water will light up , leave water will light off . Navkar Crafts oating Tealight Candles Water Sensor Battery Operated Waterproof LED Flame less Flickering Lights Perfect For Diwali Party Decorations. These floating candles light up in contact with the water. Just dry flame-less tea lights off and use again.