I did a simple test with a 9V battery. You have to connect the GND pin to the negative battery terminal and both the VCC and IN pins to the positive battery terminal to get a sound. That might be obvious to some but it wasn't to me. Anyway, all three passed the test.

I did a simple test with a 9V battery. You have to connect the GND pin to the negative battery terminal and both the VCC and IN pins to the positive battery terminal to get a sound. That might be obvious to some but it wasn't to me. Anyway, all three passed the test.

I did a simple test with a 9V battery. You have to connect the GND pin to the negative battery terminal and both the VCC and IN pins to the positive battery terminal to get a sound. That might be obvious to some but it wasn't to me. Anyway, all three passed the test.

Tutto ok

Tutto ok

Tutto ok

OK and works

OK and works

OK and works