n.

a push button at an outer door that gives a ringing or buzzing signal when pushed

同義詞：doorbellbell

a signaling device that makes a buzzing sound

Buzzers
Buzzers
Sniffers, buzzers, toggles and blinkers: dynamics ...
Good temperature stability of K 0.5 Na 0.5 NbO 3 based lead-free ceramics and their applications in buzzers
Alarm system activated by buzzers
Design and Implementation of a Piezoelectric Clutch Mechanism Using Piezoelectric Buzzers
Design and Implementation of a Piezoelectric Clutch Mechanism Using Piezoelectric Buzzers
Fabrication and characteristics of thin disc piezoelectric transformers based on piezoelectric buzzers with gap circles
CROSS COVES, BUZZERS AND GENERAL SORTS OF PRIGS: Juvenile Crime and the Criminal 'Underworld' in the Early Nineteenth Century
Cloud database resource calculations optimization based on buzzers and genetic algorithm double-population evolution mechanism