Feature: 1. DC 5V‑15V power input, 8 channels of alarm detection, each channel of alarm message users can set different content by themselves. You can choose the input port to be NC or NO to alarm. Built‑in 4G module, can work anywhere in the world through 4G, 3G and GSM Net. 2. You can set up to 6 groups of called numbers. When the alarm input has a trigger signal, an alarm message will be sent to the alarm number, or you can call the alarm directly. 3. Easy to use, we have customized APPs, APPs that support for iOS/Android systems, and can be set up by simply sending text messages through the app. 4. The low‑power sleep mode design can detect the battery voltage in real time and make a low battery voltage alarm, which is suitable for battery‑powered applications. 5. The input is a switch signal. When the input port is short‑circuited with the ground wire (GND), an alarm message will be sent to the preset alarm mobile phone or call the set alarm number. The content of the alarm message can be set by yourself. 6. It has a wide range of applications and can be used for home security, warehouses, remote unattended stations, remote monitoring of equipment parameters (such as oil pressure, air pressure, water pressure, voltage, etc.), product upgrades (voltage monitoring, overload monitoring, etc.), safety protection ( Smoke, fire, water level monitoring, gas, etc.) and other unattended points. Specification: Item Type: 4G/3G/GSM Alarm Module Material: ABS Plastic Color: BlackInput Volatge: DC 5-15V. Package List: 1 x 4G/3G/GSM Alarm 1 x Cable1 x Antenna1 x English Manual Note: Please distinguish the corresponding frequency before placing an order: European frequency: LTE‑FDD: B1/B3/B5/B7/B8/B20, LTE‑TDD: B38/B40/B41 WCDMA: B1/B5/B8, GSM/EDGE: B3/B8 Americas frequency: LTE‑FDD: B2/B4/B12, WCDMA: B2/B4/B5 Australia frequency: LTE‑FDD: B1/B3/B7/B8/B20/B28A, LTE‑TDD: B38/B40/B41 WCDMA: B1/B8, GSM/EDGE: B3/B8For IOS version APP needs to install the software for Apple's apple store, just search for GA09.