What are the dimensions of the device?

• Device dimensions are 5" x 3.25" x 1.25."

• It’s easy to mount on a wall, like just inside the nursery door (comes with screws/anchors and a wall hanging template.) It’s also easy to set on a table and move around as needed. It comes with adhesive rubber feet you can attach to the bottom to provide a little extra grip on flat surfaces like tables, counters, or dressers.

What do the buttons mean/do?