I didn't notice anything with the first one. I realized that I have a bad block. So I returned the device and bought a second device. Couldn't find anything either. Then I noticed that about 5% of the reviews complained about the same thing. I don't know why everyone didn't complain. Maybe others have never tried it. I hope they lose a lot of money because that's rubbish. Oh, I live within walking distance from my airport.
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