Bluedot Trading Submersible Tea Lights, Green, 12-Pack COMPLETLEY WATERPROOF! Because they are waterproof tea lights that are battery operated, you can put them in aquariums, vases, or other table decorations LONG LASTING & REUSABLE:Typically lasts 30-40 hours (your results may vary). BATTERIES INCLUDED: Replaceable Batteries - There are 2 per light-#CR2032 ) USE FOR ANY OCCASION: Use the lights anywhere you want to add color - weddings, fish tanks, pool, birthday parties or just daily use in your home. OTHER COLORS/ QUANTITIES AVAILABLE: Our high quality tea lights are available in virutally every color and quantity combination!