We manufacture and fit radio midi systems for your accordion.  
This usually means that we need to power the current MIDI system in your accordion through rechargeable batteries.   We use only the best high capacity Lithium batteries and miniature lightweight electronics for the midi.  We can usually convert any system to rechargeable radio.
The basic cost is from 399pounds for our own midi when ordered with a midi system.  Most others cost 599pounds while a few cost a little more if there are complications in your system.