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6 Channel Industrial IoT board based on RP2040 & ESP8266 Isolated RS485 port & isolated power supply Comes with 6 relay indicators, 1 programmable status LED, power led Control up to 6 appliances/devices on a load of, photo-coupling isolation Optocoupler EL357NC, allowing users to safely control high voltages or current devices IoTPi makes appliances smart, which users can operate via the PiRelay app on their electronic device.