4.2 inch electronic ink display module designed for low power and stable, easytoread presentation Key benefits Low power consumption: Power is used primarily during screen refresh, minimizing energy draw during standby and extending battery life for portable or remote installations. Persistent display without backlight: The nonbacklit epaper maintains the last image after power is removed, eliminating the need for constant power to retain information. Broad compatibility: Uses an SPI control interface for reliable connections. Compatible with Nano, STM32, and other common microcontroller and main control boards for straightforward integration. Versatile functionality: Suitable for any application that needs readable, lowpower visual output, from tags to asset tracking. Important attributes Size: 4.2 inch diagonal epaper display for compact signage and labeling. Technology: Electronic ink epaper delivers contrast without a backlight and holds content without power. Performance: Minimal energy use except when refreshing, making it practical for batterypowered and alwayson displays. Interface: SPI control interface ensures wide support and secure data transfer to host controllers. Practical use scenarios Retail electronic shelf labels and tags: Show updated pricing and promotions while conserving battery life between updates. Asset and inventory labels in warehouses: Display item identifiers and status with retained information during power cycles. Conference and event nametags or information panels: Present attendee names or session details without constant power, and update content as needed via a connected controller. Integration notes Connect via SPI to common development boards such as Nano and STM32 or other main control boards for rapid prototyping and deployment.