I've already find, that those internal oscillators was inside esp's chip, while there is external 40MHz crystal oscillator above the chip, still being part of ESP32 c18a47eb203aa56dbafd6de23040d7a8fb39cd7b.jpg
https://www.espressif.com/sites/default/files/documentation/esp32_hardware_design ...

Hello. I am planning to use that https://dstike.com/products/dstike-esp32-watch-devkit esp32 devkit as diy wrist. I need to keep time without NTP (as i want autonomous watch) and without RTC (as it seems, that this devkit doesn't have it). In latest datasheet I can't find any information about it's ...