This is an E-Ink raw display, 4.2inch, 400x300 resolution, with an embedded controller. It communicates via an SPI interface and displays three colours:  red, black, and white.

This display has ultra-low power consumption, a wide viewing angle, clear display without electricity, it is an ideal choice for applications such as a shelf label, industrial instrument display, and so on.

Keeps displaying last content for a long time even when powered 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/Arduino/STM32)

Technical Details:

• Operating Voltage: 3V
• Interface: 3-Wire SPI, 4-Wire SPI
• Display Size: 84.8 x 63.6mm
• Resolution: 400 x 300
• Display Colours: Red, Black, White
• Grey Level: 2
• Full Refresh Time: 15s
• Refresh Power: 26.4mW(Typical)
• Standby Power: <0.017mW
• Viewing Angle: >170 Degrees
• Outline Dimensions: 90.1 x 77.0 x 1.18mm