A compact 2.15inch electronic ink display designed for lowpower applications and easy integration with development boards. The screen retains the last displayed content without power, and consumes power only when updating the screen, making it ideal for batterypowered and alwayson projects. Key benefits and features Energy efficient: The eink panel holds the last image when power is off and only uses power during screen refresh, minimizing power draw. Clear compatibility: Built on a 40pin GPIO interface, compatible with Nano RDK series motherboards for straightforward connection. Voltage flexible: Builtin level conversion chip supports both 3.3V and 5V logic levels to work with a wide range of controllers. HAT+ Standard: Conforms to HAT+ Standard to improve interoperability with expansion boards and speed up development. SPI interface available: A reserved SPI interface simplifies connection to STM32 motherboards and other SPIcapable systems for efficient data transfer. Compact size: 2.15inch display fits into small enclosures where space is limited. How this display solves common problems Reduces power requirements for alwayson indicators by retaining the image without continuous power. Eliminates the need for external level shifters thanks to the onboard level conversion chip. Simplifies prototyping and expansion board compatibility through HAT+ Standard and a 40pin GPIO layout. Makes integration with STM32 and other microcontroller platforms easier via the reserved SPI interface. Practical applications Lowpower status panel for IoT sensors and batteryoperated monitoring devices. Compact information screen for handheld controllers and instrumentation that require intermittent updates. Development and prototyping use with Nano RDK series motherboards or STM32based systems where quick expansion and reliable GPIO interfacing are needed. Technical highlights Display type: electronic ink (eink) Size: 2.15inch Interface: 40pin GPIO compatible with Nano RDK series; reserved SPI interface for STM32 and other boards Voltage compatibility: onboard level conversion for 3.3V and 5V logic Standards: HAT+ Standard compliant This display is suitable for developers and engineers seeking a lowpower, compact eink solution that integrates easily with common development boards and supports rapid prototyping.