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Amazon.com: 4Pcs ESP8266 Serial Wifi Module ESP-01 Updated Wireless Transceiver Board 3.3V for Arduino : Electronics
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Amazon.com: ESP8266 ESP-01S WiFi Module, Pack of 4 : Electronics
Amazon.com: ESP8266 ESP-12F/E NodeMCU Development Board, WiFi Module, CH340, for Arduino IDE Micropython, Pack of 3 : Everything Else
