Extension bell

Extension telephone bell used by taxi service in Rovigo.

An extension bell or extension ringer is a device that generates a sound to indicate an incoming telephone call, but is not included in a telephone set itself.

Extension bells may be louder than ordinary telephone ringers. As such they may be used by persons with moderate hearing impairment to help them detect incoming telephone calls, especially when they are outside the telephone's room.

单词	Extension ringer
释义	Extension ringer 英语百科 Extension bell An extension bell or extension ringer is a device that generates a sound to indicate an incoming telephone call, but is not included in a telephone set itself. Extension bells may be louder than ordinary telephone ringers. As such they may be used by persons with moderate hearing impairment to help them detect incoming telephone calls, especially when they are outside the telephone's room.
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Extension ringer

Extension bell