IntroThe BTE13-010 is an cheap Arduino Pro Mini 328 clone that is made by Baite.
It is available from different sites among others Aliexpress.com
The board consists of:
Pin outThe BTE13-010 does not exactly match the current Arduino Pro Mini 328 generation with regard to pin location.
(The BTE14-02 seems to be a closer clone in this regard (but still misses the I2C pull up option))
Anyway since my brain hurts when trying to decode Arduino pin out numbering compared to datasheet names I decided that I would create the pin out image below:
The pin out is base on the following partial retrace of the PCB tracks: