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For me it's under settings, bluetooth. You can view a list of paired devices and when you select it, it connects as an audio device.

Just wanted to share a quick update about the BLK-MD-SPK-B. You can in fact control it with AT commands (I had to connect at 115200bps). To get it working with my phone (Android Galaxy S3) I had to be paired with it but not connected with it. If you're just paired with it, it works as a headset but ...

It has a serial connection and there is a huge set of commands to interface with it. Here's the link I found: http://www.elecfreaks.com/wiki/index.php?title=BLK-MD-SPK-B This is a Google translation of the Chinese Introduction: Users can through the serial port and BLK-MD-SPK-A chip communication, ...