Is this worth getting or not.

[Pudsey Bear]

I've got a refund on the inverter as it was not as described, but told to keep it. It works okay, but the ad shows it with a phone, so it assumes an app, but it doesn't have BT, so no app, and you need this https://amzn.eu/d/0aPBskj6

So, not sure if the Dongle is worth getting or not.