I never recieved a response last post ? Maybe it is not possible ? Any Ideas if it can be done or source of any Motorola Back lit DTMF mics ? Gary Hi I have a couple of CDM DTMF Mics Model #AARMN4026B that I would like to use on a Motorola Radius Radio. It Seems The Radius model HMN3175a HAS BEEN DISCONTINUED. PPT and Voice work but TTP doesn't work and no Led. Can I rewire to get to work ? Gary