Very Good quality PCB! This shield is used to HopeRF Lora module Software with ESP8266 boards it has just few minimal features. Main features: - I2C 128x64 OLED connector; - Placement for RFM95/96/98 Lora module; - Placement for SMA Antenna type; - Compatible with Hallard, JaapBraam and ComResult schematics. You can find more information on https://plus.google.com/u/0/+VladimirBakum73/posts/Yxda6rtLaED And https://github.com/hallard/WeMos-Lora