With Bluetooth and MIC, you can enjoy music wirelessly and also do the handsfree calling. The device is designed with anti-interference processing and noise cancellation technology to give you crystal clear sound in a call. But some user reported that due to the position of mic, it do not catch your voice. 

This is the only device that I found comes with the Siri support, long press the control knob to activate the Siri and now everything will be on your voice command. It’s pretty interesting.