Doorbell with over voltage protection device

The utility model discloses a doorbell with an over voltage protection device. The doorbell with the over voltage protection device includes a box; a display, a loudspeaker and matrix buttons disposed on the box; a PCB disposed in the box; a single chip disposed on the PCB; and a function conversion...

Ausführliche Beschreibung

Bibliographische Detailangaben

1. Verfasser:	HUANG DANJUAN
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ALARM SYSTEMS ORDER TELEGRAPHS PHYSICS SIGNALLING SIGNALLING OR CALLING SYSTEMS
Online-Zugang:	Volltext bestellen
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