The 2.13inch E-Ink raw display panel is an E-Ink raw display, 2.13inch, 250×122 resolution, with embedded controller, communicating via SPI interface, supports partial refresh.
Features

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

Comes with development resources and manual (driver board schematic, examples for

Raspberry Pi/Jetson Nano/Arduino/STM32)

Resources
Wiki :www.waveshare.com/wiki/2.13inch_e-Paper_HAT