I bought this small cheap transformer for my nest hello smart bell, it has 3 input options "4 wires" if i use 220v input wires it gives me 30 volt output without load of course.
If i use the 440 input wires it gives me 15 volt output, also without load.
My question is:
Is it safe to use the 440 input wires with my 230v outlet socket?

[![enter image description here](https://i.stack.imgur.com/nM4dt.jpg)](https://i.stack.imgur.com/nM4dt.jpg)[![enter image description here](https://i.stack.imgur.com/FG6Ts.jpg)](https://i.stack.imgur.com/FG6Ts.jpg)

[3](https://i.stack.imgur.com/1PkvA.jpg):