I bought one of these, mainly because it has an SMA connector, versus the second rate u.fl connectors on other boards: while searching for a proper pinout diagram, because that one up there from the vendor sites on Alibaba and Amazon has two errors, I stumbled across this pearl of information: https://www.thethingsnetwork.org/co...3_v16-on-pcb-battery-exploded-and-got-on-fire you can run it off the USB connector, you can run it off the battery, or you can do both and burn your house down. here is how you fix that: https://ea4eoz.blogspot.com/2019/08/fuses-in-ttgo-lora-v16.html I found a corrected version of that pinout. it has Xs over the errors, and the correct numbers added to the left. not the letters: 0 and 4, vs GPI00 & GPI04. The spelling of Buletooth remains unchanged. no program has compiled for it yet when I select board "TTGO LoRa32-OLEDV1", or any other ESP board next time, research first, buy later.