Features: 1.DC5V?16V power input, you can choose the input port to be NC or NO alarm mode, eight?way alarm detection, each alarm SMS user can set different content by themselves. 2.Up to 6 groups of called numbers can be set. When the alarm input triggers the signal, an alarm message will be sent to the alarm number, or call the alarm directly. 3.Easy to use, we have customized APP, also support for iOS and for Android system APP, you can simply send text messages through APP to set up. 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 of GL09?B is a switch signal. When the input port is short?circuited with the ground (GND), GL09 will send an alarm message to the preset alarm phone, or call the set alarm number. The content of the alarm message can be set by yourself. 6.Wide application areas: mainly 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.) Specification: Cpmdition: 100% New_x000D_ Item Type: 8 Input GSM Alarm System_x000D_ Material: ABS_x000D_ Color: Black_x000D_ Input Voltage: DC5-16V_x000D_ Working Frequency: _x000D_ UMTS: 850/900/1900/2100MHz_x000D_ GSM/EDGE: 850/900/1800/1900MHz PackageList: 1 x 8 Input GSM Alarm System 1 x Cable1 x Antenna1 x English Manual