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1. EDR Class 2 A2SP & AVRCP HSP. Middle button: Accepting calls and starting-stopping.
2. RGB color illuminated on/off button. Right button: Volume up - skip to next song.
3. Wireless connection up to 10 meters.
4. 3.5mm stereo audio input. Left button: Volume down - previous song transition.
5. Connection between wireless speaker and 3.5mm headphone.