LED Light Candles Battery Operated with Unique Water Sensor for Light ON. Switchless & Smokeless, just drop the candle into pot filled with water to Turn it ON and make it a floating Light. Sensor makes the light automatically ON when the Candle is floating on Water. Replaceable Battery: 1 No. of CR2032 Lithium Polymer Battery inside, Easy to replace. Just twist the bottom handle anti clockwise as per arrow direction on candle to open the candle and replace the battery. Safe for Kids Easy to use. Light up your Home or Event or your dining table. Good choice to Lightup on Diwali, Christmas, Candle light dinner, home decoration, brighten up your shop etc,