This is a 2.13-inch display HAT with an extension header compatible with Raspberry Pi series and Jetson Nano, featuring a resolution of 250x122 and black and white display colors. It has an embedded controller and communicates using an SPI interface, supporting partial refresh. It does not have a backlight and can retain the last displayed content for a long time with very low power consumption. The SPI interface allows connection with controller boards like Arduino/STM32 and features an onboard voltage translator compatible with 3.3V / 5V MCUs. The driver board version is Rev2.1 and is independent of the screen version, with only Rev2.1 currently available and QC label V4 being shipped. Online development resources and a manual are included.