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19:44, 11. Feb. 2018 = ESP32 modules with OLED display =
There are several modules available that combine an ESP32 with an OLED display. Unfortunately they is often not much info about those, especially how to use them with Arduino.
== Wemos like module ==
This is very likely a clone, as the original Wemos modules are not equipped with an OLED display.
== Module with TTGO written on it, featuring 18650 battery holder ==
This is also a clone and very likely not from TTGO. It is equipped with an OLED display and a 18650 battery holder including some kind of charging circuit. The antenna placing of the module is not very wise - the Wifi performance is reduced somewhat compared to modules with a better placing.
== Using the OLED ==
For both modules it seems that the OLED display is accessible by GPIO5 and GPIO4.