Features: High performance professional DAC decoder chip, enjoy the CD class sound quality. XQ-23 BT 4.1 can connect with two devices at the same time. Music and gaming don't interfere with each other. USB DAC function, use as USB DAC when connected with PC, improve the sound quality. Plug and play, very convenient to use. Compact and portable, the size of a USB disk, can fit in any pockets on your cloths, bags or pants. CVC noise reducing Microphone, one key to answer, crystal vocal.