Charging station whistles unpleasantly

Charging station whistles unpleasantly

Philips Sonicare HX9170 / 10 FlexCare Platinum Sonic Toothbrush, UV disinfection (Personal Care)
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Customer Review

The toothbrush cleans well, but what really bothers that the charging station is a whistling sound by itself, especially when the toothbrush does not appear on. I have the pitches 8 kHz and 16 kHz measured, ie where it hears the human ear and it sucks the most. This is apparently by design, as also confirmed by other reviews, even after repeated replacement of the device. For me this is a clear design flaw of development engineers to place the frequency of the charging coil in the audible range. Since it was saved at the wrong end, something must not happen in this price range.

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