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USB2.0 HUB module 1 to 7 USB expansion module -
5V/12V/24V power ESP8266 WIFI 16 channel relay ESP-12F Dev b -
5V/7-28V power ESP8266 WIFI eight relay ESP-12F Dev board -
AC/DC power ESP8266 WIFI four relay ESP-12F Dev board -
5V/8-80V ESP8266 WIFI dual relay module ESP-12F development -
Modbus RTU 4CH relay module RS485/TTL UART