EL Wire, ESCOLITE EL Wire Kit Neon Lights with Battery Pack for Christmas Tree,Easter Halloween DIY Decoration,Home Deco 5 by 1-Meter, 1m / 3ft (9ft RGB) ESCO-LITE tealight can use underwater all time.Easy to operate just use hand twist by ON/OFF Include Battery: CR2032 2PCS are replaceable can last around 18-20 hours ESCO-LITE warranty 1 year