Double Unit 2 Set Doorbell Door Phone Intercom High Quality

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Anti-oxidation, durable aluminum audio door phone outdoor unit.
High-quality circuit for clear voice.
Electric-controlled lock release.
Name or room number of the user can be displayed on the outdoor unit, with LED indication.
Talking distance is above 100m ((2X0.8mm2).
Inside power supply or extra power adaptor.
2-wire connection.
Assembly of outdoor unit: flush mounting.
Easy DIY installation.