Alarm hub Supports 150 wireless peripherals (6 sirens, 64 wireless keyfobs). Peripherals status display (signal strength, battery level, temperature, program version). Wired, Wi-Fi, 4G, 3G or GPRS network connection. Dual SIM and Single Standby. Automatic network replenishment (ANR). Video linkage on App. Frequency hopping function and two-way communication technology ensure communication stability. Cloud update and automatic recovery from update failure