ANMBEST Relay Module with Optocoupler High/Low Level Trigger for Arduino (3, 3V Relay 1 Channel): Amazon.com: Industrial & Scientific
Amazon.com: Eujgoov 4 Channel DC 7‑28V/DC 5V Relay Module WiFi Remote Control Development Board for ESP8266 Secondary Development Learning : Electronics
1 Channel 3V Relay High Level Driver Module Optocoupler Relay Module for ESP8266 Based Board: Amazon.com: Industrial & Scientific
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Amazon.com: 3v Relay Board Raspberry Pi Arduino Relay Module 1 Channel Opto-Isolate High Level Trigger for IOT ESP8266 Microcontrollers Development Board : Automotive
1Set for Wemos D1 Mini Relay Shield One Channel for Wemos D1 Mini Relay Module for Arduino ESP8266 Development Board: Amazon.com: Industrial & Scientific
1pcs ESP8266 WiFi Relay Module with ESP-01S Relay Adapter Module for Smart Home Appliance Connect Fan Illuminator Smart Switch Phone APP Remote Control Switch Wireless Transceiver: Amazon.com: Industrial & Scientific
Amazon.com: Taidacent ESP8266 WiFi Relay Switch ModBus TCP 1 Channel WiFi Relay Module with 1 Digital Input : Electronics