Provide online user manual (examples for Raspberry Pi/Jetson Nano/Arduino/STM32), please check the manual carefully before using!. Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards, Jetson Nano. SPI interface, for connecting with other controller boards like Arduino/Nucleo, etc. Onboard voltage translator, compatible with 3.3V/5V MCUs. No backlight, keeps displaying last content for a long time even when power down. Ultra low power consumption, basically power is only required for refreshing. Due to the advantages like ultra low power consumption, wide viewing angle, clear display without electricity, it is an ideal choice for applications such as shelf label, industrial instrument, and so on. This is an E-Ink display HAT for Raspberry Pi, 2.13inch, 250x122 resolution, with embedded controller, communicating via SPI interface, supports partial refresh. IMPORTANT: Rev2.1 is the version of the driver board, which is independent of the screen version. Currently, there is only Rev2.1; QC target V3 and V4 are screen versions, and V4 is currently being shipped. V4 version is fully compatible with V3; and it provides the demo that can realize a fast refreshing function.