The under water light show is exactly as the name suggests a light show that happens under water float but dont submerge the small unit in your bath or pool switch it on choose 1 of 5 settings and enjoy the show as red green and blue led lights flash and fade to create stunning lighting effects all over your bath or swimming poolr r powered by three aaa batteries not included the underwater light show will flash and fade for hours and hours and thanks to its lens like dome shape the