Features: Experience the convenience of the 91 Segment EPaper Display with 91 segments, perfect for partial refresh Made from high-quality plastic, this compact EPaper module, 51x34mm in driver board size, widely used for temperature and humidity sensors, digital measuring tools, and humidifiers. Connect with controller boards such as forRaspberry Pi STM32 etc. OnboardMOSvoltage transmission circuit, compatiblewith 3.3V/5V MCUs. With its low power consumption and easy-to-use I2C communication interface,is an excellent choice for anyone looking for reliable and efficient display solution. With wide viewing angle, paper-like display without power. No backlit, shows the last content for long even when it is turned off. Specifications: Model：1.9inch 91 Segment ePaper Module Driver Board Size:approx 51x34mm/2.01x1.34in Operating voltage3.3V / 5V Full Refreshing Time: 2s Bus： I2C Communication:SPI Display Colour：Black, White Package Includes: 1 Set 1.9inch 91 Segment ePaper Module note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.