An alarm panel communicates by telephone; you cannot transmit or receive a signal without a cellular backup unit to help you if your phone line goes down or is cut.
No Wires, No Worries - A perfect backup for your phone-based security system and those locations without phone service add $15.00 mo. for cell– Good for warehouse, cottage, barn or garage, Residential & Commercial.
Honeywell LYNXR-2 Wireless Security System (LYNXRPK-2)