Two way intercom system

Full-duplex communication,offer long talk and easy used;master adopt high quality speaker,voice reality and loudly.Inside circuit board pass the microcomputer dispose,can lock the volume track each other and avoid noise,can work long time.the master and substation volume can adjusted or shut off by separately,also have record-output can work with the supervise equipments.
Apply:Bank,Post ,Hospital,Station,Dock etc.