A DOORPHONE

The door phone produces an announcement sound when a sensor (1) detects a visitor at a door and generates a buzz sound when the visitor responds to the announcement sound. The door phone comprises (a) a sensor(1) to detect the visitor; (b) an alarm circuit including a buzzer and LED; (c) a voice pro...

Ausführliche Beschreibung

Bibliographische Detailangaben

1. Verfasser:	LEE, HYONG-JUN
Format:	Patent
Sprache:	eng
Schlagworte:	ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY TELEPHONIC COMMUNICATION
Online-Zugang:	Volltext bestellen
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