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
➤Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards, Jetson Nano
➤SPI interface, for connecting with controller boards like Arduino/STM32, etc.
➤Onboard voltage translator, compatible with 3.3V / 5V MCUs
➤Comes with online development resources and manual (driver board circuit diagram, examples for Raspberry Pi/Jetson Nano/Arduino/STM32)
Advantages:
E-paper display utilizes microcapsule electrophoretic technology for displaying, the principle is: charged particles suspended in clear fluid will move to sides of microcapsule when electric field is applied, making the microcapsule become visible by reflecting ambient light, just as traditional printed paper.
E-paper display will clearly display images/texts under lamplight or natural light, requires no backlight, and features nearly up to 180° viewing angle. It is usually used as e-reader due to its paper-like effect.
Onboard SPI control interface
for use with other controller boards like STM32/Arduino
➤VCC:3.3V/5V
➤GND:Ground
➤DIN:SPI MOSI pin
➤CLK:SPI SCK pin
➤CS:SPI chip selection, low active
➤DC:Data/Command selection (high for data, low for command)
➤RST: External reset, low active
➤BUSY: Busy status output (high for busy)
Specifications:
➤operating voltage: 3.3V/5V
➤grey scale: 2
➤interface:3-wire SPI, 4-wire
➤SPI partial refresh time: 0.3
➤soutline dimensions: 65 × 30.2mm
➤full refresh time: 2s
➤display size:48.55 × 23.71
➤mmrefresh power:26.4mW (typ.)
➤dot pitch:0.194 × 0.194
➤mmstandby current:<0.01uA (almost none)
➤resolution:250 × 122
➤pixelsviewing angle:>170°
➤display color:black, white 
Packing List:
➤2.13inch e-Paper HAT x1
➤RPi screws pack (2pcs) x1
➤PH2.0 20cm 8Pin x1