Contains 18 bright LED colorful lights, with three AA batteries for power, can continue to light about 20 hours, with the TRY ME function (that is a customer want to look at glow, not to press the off, it will automatically turn off. this is to avoid the loss of a customer forgets to turn off the power switch is a big advantage.) then the pool can be replaced, not afraid of wrestling, not afraid of broken, durable, cost-effective, can be arbitrarily curved.