I don’t know what is making noise - maybe the voltage on the USB radio is not stable enough, or maybe the amplifier itself, but for its price this device has more pluses than minuses. At the expense of turning off when the engine starts, I would have saved the capacitor in the design of the device, which allows the device to work for a couple of seconds when the power goes out, but it is not here, and, judging by the reviews on other devices, it is in them too. Do I recommend buying? If you like the form factor, are comfortable with the pros and cons of the device, yes.
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