Best value, Small size, 13cm x 6cm x 3cm. 12V to 24V AC or DC Power Supply. Typically powered by +12V from the Alarm panel. 2 inputs with Negative or Positive Polarity. Configurable SMS Text Messages Simple to set-up by sending short text messages from any mobile. Commands to program and use are in simple plain English. Send “test” SMS text regularly, to confirm unit operating correctly. Device sends “Credit Top Up” Messages to keep SIM on Mobile Network
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