Feature 11-Channel GSM SMS alarm, external rechargeable battery (not included) for power failure alarm. 2Send SMS alert messages to up to 6 preset mobile phones when any alert input is triggered. 3The input of GA01P is the switch signal. When the input port is shorted to the ground (GND), GA01P will send an alarm message to the preset mobile phone, or call the set alarm number. 4The content of the alarm message can be set by itself. You can use text custom alert SMS. 5Smart and slim gsm design box for easy installation on other target system boards, adding gsm alarms. 6Can be widely used to connect different sensors. Such as door magnetic switch, infrared sensor, GAS detector, water level sensor, temperature measuring device.Item Type: GSM Power Failure AlarmMaterial: ABS PlasticPower Input: DC6-15V .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x GSM Power Failure Alarm 1 x Antenna 1 x Audible Alarm