The product cannot be paired with the app. The app you download is called "AC18" (not "AC18Plus"). If you check the reviews of this app on Google Play Store, you will find that this app is a data trap. It's asking for too many permissions on your phone. Then more permissions are actually required. Also, there's no way to notify you when motion is detected. So you basically have to sit there and look at your cameras to see if anyone gets through. There should be a feature that will alert you when motion is detected. This product is completely useless in my opinion. Especially since I couldn't get it to connect to their own app.
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