Holder for dog doorbell remote. It has a hole in the bottom so it can be removed for battery replacement.
There is a groove in the back that is for a command strip to secure it to a wall.
Here is a link to the dog doorbell that I created this for: https://www.amazon.com/gp/product/B08D6BRS96/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1