Was used for powering decking lights, though states only for indoor use. I've tested that the output is 12VAC using a multimeter.
It looks like it *may* be used for powering video doorbells:
https://ring.com/gb/en/support/articles/utvz2/Guidelines-for-Hardwiring-You...
12VAC Transformer with about 6m of cable (Bellevue EH7)
This post has been withdrawn.