Severe hum while MP3 playback

Severe hum while MP3 playback

Hartig + Helling SN 20 3-in-1 Universal USB charger and power supply set black (Accessories)
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Customer Review

The Hartig Helling and USB chargers is processed at low price and solid. Disturbing is unfortunately just that when charging my MP3 player and while playing a slight hum can be heard.

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