So just ordered 4 of them to see how they go. no point in ordering one as then the post is more than it costs.
~Just remember don't try and flash them while connected to the mains, it looks like there is no electrical isolation from the mains side. I expect it's got a simple switching down converter like a lot of the LED lights now days. but the 5 volts could be five volts above neutral or 5 volts below line and one of them is going to bite.
Just got to sit back and wait for them to arrive.
Last attempt was to rip out the wireless side of a 433MHz controlled socket and fitted a 8266-1 in its place with a few transistors to invert the switch control. got a bit hot as the old rf bit did not draw as much current as the esp's do. but it did prove i could turn the Christmas window lights on and off from my phone and laptop.
Neil