Four out of four LED lights have never worked since the inception of pool. Each light lasts approximately 4-6 months before it blinks and goes out Impossible to synchronize. All lights have been replaced at least 10-12 times. One light goes out, it is replaced, and another light goes out. That light goes out and it is replaced and another two lights go out. VERY FRUSTRATING... VERY EXPENSIVE. VERY UNHAPPY with this investment. User's recommendation: DO NOT PURCHASE HAYWARD LED POOL LIGHTS.