I need to know the size of the sc rew on the bottom of the video doorbell pro. I installed it directly on the front door, and the suplied screw tool is too long to tighten the screw. I can get an allen style tool to tighten it, but I need to know the size.
I may end up relocating it if I can convince my electrician to add a transformer for me. But for now, I still have to take it off and charge it.
I think this is what you want to know?
I reread your post a few times, and blew away a really long response 
The screw head is a T8 - Torx
How about replying to a post on a forum, and spending many many minutes typing, only to hit a wrong key and blammo empty text box.
That is why sometimes my posts here have multiple edits
I have done this as well.
I have many edits too, but mostly because I can’t tell what I am saying sometimes😬
Mine is an Allen bolt