... for driver. It can provide the function of voice and data transfer on both GSM-R and 450MHz ... the Control unit,GPS unit,Record unit,GSM-R voice unit,GSM-R data unit,450MHz function unit, ... to get the relevant voice and data communication operation of known analog order.(4)Change the working mode automatically ... driver operation like dial etc.(3)Word and Voice cue of working state.1.2.3 HandsetHandset ...