1. 1-channel GSM SMS alarm, external rechargeable battery (not included) for power failure alarm. 2. Send SMS alert messages to up to 6 preset mobile phones when an alert input is triggered. 3. The input of GA01P is the switching signal. When the input port is shorted to ground (GND), GA01P will send an alarm message to the preset mobile phone or call the set alarm number. 4. The alarm message content can be defined by itself. You can use customized alert SMS. 5. Smart and slim GSM design box for easy installation on other target system boards, 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. Specification: Item Type: GSM Power Failure Alarm. Material: ABS Plastic Power Input: DC6-15V Package List: 1 x GSM Power Failure Alarm 1 x Antenna 1 x Buzzer Alarm