Replacement speech model for use with all M51 (THK) older models (square buttons and separate name) door entry systems to provide full duplex speech between the front door panel and the telephone. Totally encapsulated unit houses weather resistant plastic cone loud speakers and amplifier circuits.
Replacement speech model for use with all M51 (THK) older models (square buttons and separate name) door entry systems to provide full duplex speech between the front door panel and the telephone. Totally encapsulated unit houses weather resistant plastic cone loud speakers and amplifier circuits.
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