The GSM communicator provides a simple yet effective solution to all of your security equipment notification needs. Once triggered the GSM communicator automatically makes call & sends a text message to phone numbers stored in it, providing a fast and reliable warning, ensuring total peace of mind. The GSM Communicator can be connected to any device which provides NO/NC volt free alarm signals such as intrusion alarms, fire alarm, DVR, fridges, etc.The device can also be used as SMS Alert device by connecting it to a door using a sensor.