GSM & PSTN Double Network Alarm System
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GSM & PSTN Double Network Alarm System
GSM & PSTN Double Network Alarm System
when PSTN line is lost ,alarm out though GSM network;when GSM network is interrupt,alarm out though PSTN network. normally, alarm out will secter PSTN line for lower cost,and SMS will sent though GSM network if needs.
this is a good product for alarm use.
Thanks for you care for.