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Most convenient programming of a ESP8266 ESP-01 using a CH340G USB converter. Dimensions of ESP-01 (L x W x H): 24.5 x 14 x 11 mm. Dimensions of USB adapter (L x W x H): 49 x 17 x 9 mm (17 mm height, including ESP-01). Controller with 1 MB Flash Memory and 80 MHz for autonomous work, even via WiFi 802.11 b/g/n with up to 400 m range. --