I bought a set of battery led fairy lights.
Using 3 AA batteries in series (4.5vDC) the battery box has a sequence button for various modes. It also times out after six hours and the batteries last about three days.
I decided to connect a 4.5v dc transformer to the two feed wires.
Surprisingly only two of the four colours lit up.
Reversing the polarity lit up the other two colours.
there are only two output wires and connected to the box it was possible to have all colours continuously lit.
Can it be sending tiny bursts of alternating current in DC…… yes I know it makes no sense but I am baffled!!!