Unable to connect Energy Sistem music box 9 to MacBook via Bluetooth

Hello,

I just bought an Energy Sistem Music Box 9 and wants to connect it via bluetooth to my macbook. The speaker works just fine with my iPhone, but doesn't work with my Macbook. The speaker keeps on disconnecting. Sometimes it connects but doesn't get recognized as a speaker.

All other bluetooth devices work fine with my macbook.

Any idea what this can be due to ?

[Re-Titled by Moderator]