Features: Energy efficient 3.97inch E paper Link display module maintains crisped content delivers 800×480 sharpness with red, yellow, black, and white output for multiple development boards. Features shifting chip for 3.3V/5Vcompatibility and wide viewing, requiring not with backlight while preserving last screen data during power interruptions. Designed for developers, industrial engineers, and makers low power visualization for intelligent device prototyping. Perfect for digital shelf labels, warehouse inventory trackers, factory equipment monitors, and energy efficient instrumentation requiring persistent display updates. Streamlines prototyping easy for HAT standardization, enabling rapid expansion through SPI communication and industrial grade plastic housing durability. Specifications: Working voltages: bare screen version: 3.3V, module version: 3.3V/5V. Display colors: red, yellow, black, white. Display size: about 86.40x51.84mm/3.4x2.04in Features 800×480 sharpness With red, yellow, black, and white output; 2gray scale Version: Screen version / Module board Package Includes: 1PC 3.97inch E Paper Screen note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.