USB stick module for programming the ESP8266, in ESP-01 design The ESP module is plugged into the USB stick and the stick is connected with your PC or Raspberry Pi. This then establishes a serial communication interface between the PC and the ESP8266 module. The power required for programming is supplied by the USB. ESP8266 module not included in delivery. https://elecena.pl/product/12940606/sbc-esp8266-prog-development-boards-esp8266-usb-programmer 2017-12-14 https://elecena.pl/product/12940606/sbc-esp8266-prog-development-boards-esp8266-usb-programmer 2021-05-16