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Sonic Alert doorbell singulars can be both of buzzer for front lobby and wireless button for apartment room door to work.See more info on it.http://www.harriscomm.com/catalog/product_info.php?cPath=1140_44_128&products_id=16832
Sonic Alert doorbell singulars can be both of buzzer for front lobby and wireless button for apartment room door to work.
See more info on it.
http://www.harriscomm.com/catalog/product_info.php?cPath=1140_44_128&products_id=16832
