Engineering gateway. Zigbee Smart gateway + Bluetooth gateway function; input: DC 5V 1A or POE power supply; you can access TCP/IP or connect to Wi-Fi; metal shell, 2 external Wi-Fi antennas + 1 Zigbee antenna; covering an area of about 200 square meters; can add 200 sub-devices; has the function of replacing the faulty gateway with one button; after the network is disconnected, the local area can still control it.