How to unpair bluetooth device in Windows?

Hi guys,

I just bought a Bluetooth receiver for my speakers:

My problem is: I cannot find a way to unpair the device (and so, the speakers) in Windows without basically uninstalling it. In Windows Phone I just have to tap it in the list to pair/unpair but I see no such option in Windows be it on Metro or Desktop side.

Any idea?

Oh and also, the device is NFC enabled but my Lumia 820 seems totally unable to detect it...

EDIT: nvm about the NFC, was just not tapping the right area of my phone ^^