Is this "stereo" bluetooth receiver a scam product?

We bought a Bluetooth receiver for use with a car stereo "aux" input. But it didn't work at all well. Was it a scam product? Was it just a one off defective device? Or was there a good technical reason for the way it was behaving?

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Music “Let It Run” with permission, copyright Cristie/MacFarlane.

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00:00 Introduction
02:47 Investigate
03:36 IC is AC6969A
08:56 Found the problem!
13:14 Conclusion

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