No backlight required, the last screen display can be kept for a long time after power failure The power consumption is very low, basically only consuming power when refreshing The following only applies to the module version:Based on for Raspberry Pi 40PIN GPIO interface design, suitable for Raspberry Pi, Jetson Nano Adopting for the Raspberry Pi HAT+ standard, the interoperability of the expansion board is improved, helping developers to design and develop faster, use various external devices more easily, and expand the functions and performance of for the Raspberry Pi Reserved SPI communication interface for easy access to for Raspberry Pi / for Arduino / STM32 / ESP32 and other main control boards Bare screen version: 3.3V Communication interface:3-wire SPI,4-wire SPI Display colors: red, yellow, black, white Grayscale:2 fast refresh:13s Global refresh:21s Refresh power consumption: Less than 90mW point distance:0.108 x 0.108 (mm) Sleep current Less than 0.01uA (close to 0) resolution:800 x 480 pixels Viewing angle: Greater than 170° (The product printed words may vary depending on the batch, but this does not affect use) Specifications: B Bare board Color: As Shown Material: LCD Package Contents: 1 x 3.97inch e-Paper(The color and style of the screws are random, and specified colors and styles are not accepted)