Review on 📶 KeeYees 2 Pack ESP32 Mini WiFi + Bluetooth Development Module Expansion Board Chip ESP-WROOM-32 for NodeMCU and Arduino - Upgraded for Internet Connectivity by Megan Sweet

As my Viennese colleagues have discovered, a 3.3V regulator connected to the USB interface can only supply 150mA when the ESP32 is in the worst case is designed for 500 mA. For this module, the only time that can make a big difference is WiFi transmission. You can run both CPU cores and at least one core plus bluetooth and *probably* be fine, or you can add a large "decoupling" capacitor, or your own regulated 3.3V supply, or replace the tiny regulator chip , but that's all unsatisfactory solutions to a fundamental design flaw, so in all honesty you should probably just buy a better module. Otherwise they appear to be normal ESP32 modules. The short form factor is achieved by using four rows of connector solder points and they give you four short pin headers and two long pin headers for the breadboard and you can solder any combination you want. The pins on the breadboard are useless because you can really only put them on the inner rows of pins, but then you don't get a ground pin, as another reviewer pointed out (not a big deal IMHO, but another weird design choice). If you use the outer rows, the pins take up the full width of a standard breadboard and you don't have to connect anywhere. I flashed MicroPython on one of them and everything worked fine. If you really want all of this to work in a Wi-Fi app, you could have some success by setting Wi-Fi to run at a lower transmit power, although you would obviously sacrifice some range and performance to do so.