PSTN+GSM Alarm System, S3528, CE Approved: King Pigeon is a Professional GSM Alarms, GSM Alarm system, GSM MMS Alarm, GSM House Alarm, GSM Control Alarm, GSM SMS Alarms, Fixed Celluar Terminal, Fixed Wireless Terminal OEM ODM Manufacturer in China. The PSTN+GSM Alarm System S3528 is a new security protection solution. It is special for home, house and office and other applications. It based on Wireless GSM Communication network and traditional telephone line, when the telephone line was cut or problem, it can alert you by Wireless GSM Communication network. The PSTN + GSM Alarm System support international Ademco Contact ID protocol, very useful for the customer who worries about the PSTN line with problem. The PSTN + GSM Alarm System supports PSTN and GSM communication network. The user can plug the land line or not use the land line, but if have connected the PSTN Land line with the control unit, it will dial with the land line; Send the SMS by the GSM SIM card. If not connected with land line, the control unit will dial with the GSM SIM card and send the SMS, too. The S3528 integrated Voice recording function. The owner can record up to 12S voice for his address. When any sensor activated, it will alarm to the Monitoring center, also, it will call the pre-set phone numbers immediately. The S3528 equips with LCD display entire operation menu, all operations and settings are visual and intuitive! What you need is a SIMCard which supports Call ID function.