1. GSM&PSTN dual network communication，voice alarm , SMS alarm；2. Stop Voice dialing by operation on phone/mobile phone 3.Circulatory dialing to 4 set fixed/mobile phone numbers. each number could be up to16 digits 4.could be triggered by NO/NC, or 12V DC power supply；5. relay N.O/NC output after triggered(15min)； 6. Support 10-12second recorded voice when alarm dialing and this recorded message could be updated；7. Could be used with any alarm reporting system. 8. GSM frequency: 900MHz/1800Mhz or 850Mhz/1900Mhz/900MHz/1800Mhz
