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The PA-219 is for those who want to keep their existing doorbell pushbutton. It mounts below your pushbutton. The unit has an on-off switch allowing you to turn it off at night. The unit is not wireless and no battery to replace. It rings the doorbell when your pet comes home and adds home security because it rings your doorbell if a person comes to the door and does not ring the doorbell. Other uses for this are, automatic doorbell, doggie doorbell, Cat doorbell, dog bell. Works great with outdoor cat and house breaking a cat, or poty
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