Severe hum and to poor sound

Severe hum and to poor sound

Bolse® 12W Portable Smart NFC Bluetooth v4.0 speakers (two large 40mm driver 6W) with touch control function and up to 15 hours of play time for smartphones, tablets PC, laptop, Ultrabook, with Microphone (Wireless Phone Accessory)
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Customer Review

After the positive reports and the reasonable price I decided to order this speaker. Unfortunately, I can not report much positive! The Bluetooth connection did work in the 2nd run, but the sound was then came across more than modest. There's no bass and no heights. To listen to the whole speech would ev. Still bearable, but then the murderer came for this device ... namely a rather violent hum.
So there was unfortunately only the return !!!

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