It Is Rung to Alert a Homeowner to Visitors

Puzzle 11 of Buying Books Piece of Cake Pack

Question is: It Is Rung to Alert a Homeowner to Visitors

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.