A disco ball that floats on the top of a pool, spa or bath that creates an amazing under water light show. It's like having a disco in your pool with 5 different modes from fast to slow and auto shut-off. Runs on 3 x "AAA" batteries. Perfect for that next barbeque, function or party. Note: This size is ideal for a bath, spa or smaller pool. Larger pools may require two or more units.