No backlight required, the last screen display can be kept for a long time after power failure Very low power consumption, basically only consumes power when refreshing The electronic ink screen uses "microcapsule electrophoresis display" technology to display images. Its working principle is that charged nanoparticles suspended in liquid migrate under the action of the electric field, and form a display effect close to traditional printed paper through reflection under ambient light. The electronic ink screen can display images clearly under ambient light such as light and natural light, without backlight, and the viewing angle is almost 180. Because of its display effect comparable to traditional paper, it is often used in applications such as readers. Application scenarios,Applicable to shopping mall price tags, asset equipment labels, electronic shelf labels, conference name tags, etc. Working voltage:A Bare screen version: 3.3V Communication interface:3-wire SPI,4-wire SPI Grayscale:2 global refresh:21s Module version: 103.0 x 78.5 (mm) display size:84.8 x 63.6 (mm) point distance:0.212 x 0.212 (mm) resolution:400 x 300 pixels Refresh power consumption: Less than 30mW Sleep current: Less than 0.01uA (close to 0) Viewing angle: Greater than 170 Colour: As Shown Material:PCB Package Contents: 1 * E-Ink Display Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.