With ESP8266 Wifi module,4-layers board design. 220V 10A relay, one normally open, one normally closed. Onboard Relay:5V,10A/250V AC 10A/30V DC relay. Relay 1 [#8467]. Relay 2 [#8468]. One way optocoupler isolation input, TVS input protection.
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ESP8266 & ESP32 – Tagged Relay – diymore