Source: Press Release, Last Accessed: 2016/09/08

Astell&Kern launched their first portable Bluetooth headphone DAC/amp, the AK XB10. The AK XB10 provides a way for people to use their current collection of wired headphones and earbuds wirelessly with their smartphones, even if the smartphone does not have a headphone jack. Featuring Qualcomm’s aptX HD protocol, the AK XB10 supports up to 24bit/48kHz audio playback over Bluetooth and combines a dedicated DAC with A&K's AMP technology to provide plenty of power to drive high-impedance headphones with no compromise in sound quality the press release notes.
The amplifier features a built-in DAC and supports both 3.5mm unbalanced and 2.5mm balanced headphones. The AK XB10 features a power button, and volume up/down, play/pause and fast-forward/rewind buttons so the user can control the music playback even if the smartphone is in a pocket or bag.
The device offers full smartphone integration, therefore when the phone rings, it will automatically pause the music while the built-in microphone allows answering the call without ever taking the headphones off. Once the call is complete, music playback continues.
The AK XB10 comes with a removable clip to attach to clothes. Battery life is about 5 hours of audio playback on a single charge with 300 hours of standby time.

For more information: http://www.astellnkern.com/

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