M5Stack MQTT Unit with RJ45 Port is a communication module embeds an ARM Cortex-M3 processor with a W5500 Ethernet chip, UART communication interface (AT command control), and integrated RJ45 adaptive 10/100M network port. The MQTT Unit offers a 4 Topics subscription, including extremely low network latency. The M5Stack MQTT Unit with RJ45 Port is ideal for various industrial automation, security monitoring systems, automatic measurement and control systems, and equipment data on the cloud.