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ESP8266 ESP-01 ESP01 Serial WiFi Wireless ESP-01 Adapter Module Compatible Serial Module 3.3V 5V, US $ 0.8 - 1.3 / Piece, Guangdong, China, OriginalBrand, ESP-01 Adapter.Source from Shenzhen Rainbowsemi Electronics Co., Ltd on Waimaotong.com.