I was surprised by the audio quality of the in-ear headphones that feature a regular maintenance and good soundproofing.
The music is transmitted with powerful bass and clear treble. The centers could be drawn even more differentiated. The quality of in-ears is really very close to my Sony MDR-EX 90 In-Ears.
The integrated battery lasts in normal use for several hours a day for several days and is recharged in about 2 hours..
Another practical feature is the USB Micro-Stick adapter, which can be used along with a micro SD card as "Memory Stick". This addition would not have been absolutely necessary because the headset can also be connected via a USB cable directly to the PC and can be used as an external data storage.
Conclusion:
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Look well-designed headset that together with an Xperia smartphone works perfectly and also provides an above-average sound quality.
Unique buy recommendation!