Generic rain sensor to HA - Is this 433 supported by integration?

I bough a rain sensor with a receiver to a friend that has broken, the senso is OK and I thought I could re-use it in my HA solution.
The sensor looks like this:

I am using RfxTrx for the 433 devices - any way to get this sensor in to HA or is this now just electric vaste…

Looks similar to this one:

No clue about RfxTrx.