Product description:

OKRA0420BNS830F0 is a 4.2 inch black and white color E-ink display, 400x300 resolution,communicated through SPI interface, with embedded controller (COG package) and waveform can be stored in the on-chip OTP or written by the MCU, supports 2 grayscales   and partial refresh.   

Advantage:   Ultra-low power consumption,viewing angle close to 180 degrees, readable in sunlight. It is an excellent choice for applications such as shelf labels, smart labels, wearables, smart home applications, industrial instruments, smart cards and other related products.