Electronics. You get what you pay for.
I needed a car stereo for the missus car and found various units available on the net. Ended up getting a in dash DVD and separate motorised screen. The screen works but is noisy when it comes out and retracts back. The DVD player had a USB port for MP3 that never worked and there was no noise filtering on the power supply so had to install a filter on the supply to stop the engine noise. The FM receiver is that weak that I reckon it would struggle to get a clear signal if it was parked next to the transmission tower and after about 6 months it stopped reading discs. So the missus is nagging to have it replaced.
Conclusion: Cheap Chinese electronics aren't quality items without the name brand mark up, they're just cheap electronics.
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