Ding Dong, Ring It When Going to a Friend’s House

Puzzle 8 of Countdown to 2020 Piece of Cake Pack

Question is: Ding Dong, Ring It When Going to a Friend’s House

and the answer is: DOORBELL

Word Meaning:

DOORBELL — A bell, buzzer, or chime device mounted on or adjacent to a door's exterior, meant to be rung by a visitor to announce one's presence.

Definitions from Wiktionary.