M.best 12pcs Waterproof Round Battery Powered Many Colors Flower Mini led Candles Lights for vases Centerpiece Wedding Party Decoration (Multi-Color) Submersible,flameless,high safety. Can be turned on or off by twisting the base of the unit. Don't emit heat and don't get hot from hours of burning, not a fire danger. Use CR2032 Submersible Batteries which are included and are already installed. These batteries are replaceable. They can turn a boring bowl into a beautiful and exciting centerpiece. They are popular to use for wedding, party, decoration, Christmas, birthday etc.