1) Avon commercial sound 2) Bell 3) Button 4) Button for requesting entry 5) Buzzer 6) Front door ringer 7) Push 8) Push button 9) Push button to ring 10) Salespeople push it 11) Summoner, sometimes 12) Summons, of a sort 1) Bells 2) Buzzer 3) Chime 4) Chimes 
A doorbell is a signaling device typically placed near an entry door to a building. When a visitor presses a button the bell rings inside the building, alerting the occupant to the presence of the visitor. Although the first doorbells were mechanical, activated by pulling a cord, modern doorbells are electric — they are actuated by an electric s...
[n] - a push button at an outer door that gives a ringing or buzzing signal when pushed
bell 2 buzzer noun a push button at an outer door that gives a ringing or buzzing signal when pushed
a bell chime, or the like, at a door or connected with a door, rung by persons outside wanting someone inside to open the door.