... 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 ... , wherever you are. For security reasons, a PIN code must be used for access. 10. Can ... detector, a wireless door/window gap detectora siren, two remote controllers, a power supply, 1 manual product ...