Soondar Muilticolor Waterproof Wedding Underwater Battery Sub LED Lights(7 Color Automatically Change) + Remote(On/Off Function) Submersible Bright Light for wedding, pool,arrangements and some special events 2pcs CR2032 Batteries included;it can last about 15-30 hours;the batteries can be replacable after using out Please note the +/- polarity when you replace the battery. The + polarity should on the down side. Unit Dimension: 30*30*25mm.