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If you do not have a landline telephone or you have VoIP, the TG-1 ensures that your alarm system is monitored and communicates with the monitoring facility. This unit is for full-time dial out. |
If you have a landline telephone and the service is interrupted, the TG-4 ensures that your alarm system is monitored and communicates with the monitoring facility. This unit is for back-up to a landline telephone. |