Features: Standard interfaces electronic ink screen driver board: supports nRF528xx and other series of development boards Can drive multiple SPI interfaces electronic ink screens with bare screens. Based on standard interfaces design, compatible development boards such as nRF528xx XNUCLEO, etc On board level conversion chip, compatible 3.3V and 5V microcontroller interfaces On board MX25R6435F Flash chip Reserve external memory storage chip soldering positions and support freeexpansion of memory Specifications: Working voltage: 3.3V/5V Communication interface: 3-wire SPI, 4-wire SPI Flash memory capacity: 64M bit/8M byte Memory: reserved package: SOIC-8 External dimensions: approx 53.34x53.34mm/2.1inx2.1in Package Includes: 1Set ePaper Display note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-2cm error due to manual measurment.