Good morning, SF. I'm here with questions again.

I was recently helping set up a Simplisafe system, and the homeowner had added the video doorbell. In the process of setup, I noticed that the doorbell unit (the box on the wall in the hallway) was making a growling/buzzing sound. I don't know how else to describe it, other than it sounds like the mechanical timer I sometimes plug into an outlet ahead of the percolator, but louder.

One thing led to another, and I ended up bringing the system to my house for some additional setup. I've just removed my standard doorbell button and installed the Simplisafe device, and decided to take a moment for some coffee. While sitting here, I noticed sort of a low grumble... not unlike Mom's ancient electric clock. As I walked around the house I passed by the doorbell unit. Guess what! That's where the sound is coming from.

So it appears there's something in the Simplisafe device circuit that has the bell-ringer solenoid partially energized (?) all the time, creating the buzzing sound.

Questions:
1. Why?
2. Is it normal?
3. Has anyone else here noticed this?
4. What else should I know?

Thanks, all. As always, I appreciate the help and guidance.

Mine doesn't. Check short circuit across bell terminal. It is possibly a short with resistance.

There is a lot in their forums in this
Something about the doorbell mismatch with the camera

Mine works fine , but I believe there is a kit they will send to install across the camera to fix this

You need to contact their support and they send for free

I have simplisafe with the doorbell and I don’t hear any buzzing or other noises from the doorbell.