Wireless Midi - Brain Jr

Hi Livid Forum.

I am building a custom midi expression gadget designed for use whilst playing the guitar.  I would really like it to be wireless, but don't know the best way to achieve this.

I notice many of the Livid controllers (eg Guitar Wing) come with wireless communication with USB dongle, but no hints as to how this can be implemented in the diy Brain or Brain Jr.  Does anybody know what technology is used for the wireless communication?, and if/how it can be applied to Brain Jr

Many thanks