GSM 3G 4G Wireless Relay Controller 8 DO Output Support ModBus RTU/Cloud Platform Remote Control ,Easy to Use

1. Can be operated from anywhere, no distance limitation; 2. Quad band 850/900/1800/1900Mhz GSM GPRS Module inside. 3. 3G/4G/NB-IOT Modules are optional; 4. Modular design, can easily upgrade the cellular module if network upgrade; 5. Embedded 32 bit ARM9 MCU, reliable performance with in-built watchdog;