LOVE them! You can set each door bell with a different tone/song the program has installed. (The instructions are easy to read and set system up.) This allows us to know which door bell was rung. Even put one on the garage, so if someone rings the front or back door the plugin sound control alerts me, that someone is here. Yep, they all talk to each other through the plugin sound unit.Great for those hard of hearing since the blue circle it lights up.
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