We have one near the back door and one where the dog goes through the patio. We have dogs barking at the back door as a notification and a ringtone for the dog to let us know to open the door for them. I like that it's a single receiver as it requires an outlet (which also saves big batteries that others need for a receiver). We chose a parking dog for the tailgate because the device (music) could be heard on approach, but the sound of a dog barking isn't as obvious (or worse) to visitors. I highly recommend!
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