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Our customer lives in a duplex attic apartment, but since he cannot hear the sound of the bell downstairs from above, we pulled cables to the upper attic in the same way and made the connections. When the bell rings, it rings at the same time and he can both talk and open the door from the floor he is on. I shot this video for you, I hope I can share useful information and videos with you. DON'T FORGET TO SUBSCRIBE TO MY CHANNEL!!!