... alarm e.fine quality home gsm alarm systema.two way communicationb.use SIMCOM gsm modulec.with ... :REH3201.Use SIM900B GSM module---industrial module .Two-way to communication,to talk with people who ... line. 4.Can set HOME arm/AWAY arm 5. When alarming, system plays the recorded voice at ... detector, a wireless door/window gap detectora siren, two remote controllers, a power supply, 1 manual product ...