No backlight is required, and the last screen display content can be for a long time when the power is turned off. The power consumption is very low, and basically only consumes power when refreshing. Based on the for 40PIN GPIO interface design, it is suitable for series motherboards and for Nano. The SPI control interface is reserved, which can be connected to the main control board such as for / Nano/for /STM32. The onboard level conversion chip is compatible with 3.3V and 5V microcontroller interfaces. Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Color:As Shown Material:PCB Package Contents: 1 * E-Paper electronic ink screen 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.