Soondar&reg; 12x Aquarium Fish Tank Bar Waterproof Submersible 3-LED Tea Light, Vase Light, Remote Control LED Light Submersible Bright Light for wedding, pool,arrangements and some special events 2pcs CR2032 Batteries included; Usually it can lasts 10-15 hours (The operation mode of the different results may be different), easy to replace the battery Please note the +/- polarity when you replace the battery. The + polarity should on the down side. Unit Dimension: 30*30*25mm. Battery last time: 10 to 15 hours