This is a contactor relay, which gives you that satisfying click when it engages a heavy circuit.
Lot of 3 LEVITON ODC0P-D0W Daylight Harvesting C. Photosensor LV Indoor [BB 1]
You will find that the unbranded design things basic, which makes troubleshooting quick and stress-free for most setups.
A nice touch is that the auto-off timing feels natural, not too quick, not too slow.
The auto-off really shines when you forget a device running and it gracefully powers down on its own.