Description: brand new and high quality Features: No backlight is required, and the final content can be displayed for a long for time even if the power is off. Ultra-low power consumption, basically only consumes power when refreshing. SPI control interface, which can be connected to control boards such as for Raspberry Pi/Jeston for Nano/STM32. The onboard level conversion chip is for 3.3V/5V single-chip microcomputer interface. Comes with development resources and manual (examples for Raspberry Pi/Jeston for Nano/STM32). Specifications: Operating Voltage: 3.3V/5V Interface: 3-wire SPI, 4-wire SPI Screen Dimensions: 27.6mm 27.6mm Dot Pitch: 0.1380.138 Resolution: 200200 Pixels Display Color: Red, Black, White Gray Level: 2 Full Refresh Time: 8s Refresh Power: 26.4mW(typ.) Standby Current: 170 Size: Approx. 4833 mm/1.89x1.30 inch Note: Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you mind. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Piece 1.54 inch e-Paper Module