Small size OLED, display on 128*64, and two types of interface IIC and SPI (on two different boards). Drive IC is SSD1306, easy to find arduino library for it.
Super low power consumption only 0.06W on regular display, not TFT display can compare.
Industrial level temperature: -30- 70 degree.
Application: design for size, quality and power consumption oriented products: smart watch, portable industrial, medical devices, special headset, player, etc
Note: There are two types of boards, with two different types of interface, not on one board.