1. 1-channel GSM SMS alarm, external rechargeable battery not included for power failure alarm. 2. Send SMS alert messages to up to 6 pre-configured mobile phones when any alert input is triggered. 3. The input of GA01P is switch signal. When the input port is short-circuited to GND ground, GA01P will send alarm message to the pre-configured mobile phone or call the configured alert number. 4. The content of the alarm message can be configured by the user. You can use customized SMS alert messages in text. 5. Smart and slim GSM design box for easy installation on other target system panels, adding GSM alarms. 6. Can be widely used to connect different sensors. Such as door magnetic switch, infrared sensor, GAS detector, water level sensor, temperature measuring device.