my wife bought a halloween tree (like an xmas tree if it was goth and had no leaves) and not only was it not mains powered as described but the three 1.5V AA batteries were put in series with a resistor that was dropping 1.6V and getting so hot that touching it was painful. what a wasteful and dogshit design. I have now made it USB powered with a little 3.3V PoL switching regulator and a 500mΩ series resistor instead.