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BackEZ-BLE PRoC Module (Bluetooth Smart) 21 Pin Module Digi XBee SMT RF ESP WROOM-02 espressif esp8266ex 2.4 GHz Wi-Fi https://www.espressif.com/sites/default/files/documentation/esp32-s2-wroom_esp32-s2-wroom-i_datasheet_en.pdf.
- For: MCV_1,5/2-GF-5.08; number of pins: 07.
- Http://www.kingbright.com/attachments/file/psearch/000/00/00/CA56-12CGKWA(Ver.9A).pdf 4 digit 7 segment LED.