Wandafull Set of 10 Waterproof Wedding Underwater Battery Sub Lights LED Wedding Tea Light Underwater Lights (Red) Submersible Bright Light for Wedding Arrangements, Center Pieces, Fish Tanks and much more. Approximately 1" tall and 1.25" wide Replaceable Batteries - There are 2 per light-#CR2032 (initial 2 batteries included) Typically lasts 30-40 hours (your results may vary)