Review on UWDESY Light Lights Remoate Controller by Chris Burns

I ordered 2 sets - received separately. Either a part is missing or the controller (flat exit) is not compatible with the light guide (round entrance). No instructions are included other than the app. So I have no idea if the problem is an incompatible part or a missing part. Also, I was hoping the instructions would clarify whether or not the LED lights need to be underwater for cooling. No instructions.