Small case for the Zuidwijk ESP Doorbell PCB.
Features a snap lid to mount the box on something.
Also has a hole for the ESP8266 USB connector, and a small reset hole.
The PCB is held in place with 2 smaller snaps within the case.
Not affiliated link to product:
https://www.zuidwijk.com/esphome-based-doorbell/
The author hasn't provided the model origin yet.