I do not have fingers, but I have a ring. Dogs bark when ................. in their games. What am I?

Question

I do not have fingers, but I have a ring.
Dogs bark when they hear me ding.
I introduce visitors, though not by their names.
Naughty little children push me in their games.

What am I?

Answer 1

Door Bell is the answer

Answer 2

A Bell.....................

Answer 3

The doorbell