incorrect voltage applied, dev board still worked
The module contains an extremely simple circuit:



The sensor is probably a mechanical one (metal ball or spring) so that works at almost any voltage. The opamp is an LM393 which works form 2 V supply and more.

So there's no reason why it would not work at 3.3 V.

Note however that I personally would not use this circuit as it has issues in its design. There's a reference circuit in the datasheet of the RZ801 which will work much better.