It is compatible with for , for PlatformIO, for Micpython and other development frameworks, can be used to develop applications such as electronic tags and identity tags, it is also possible to run open source projects like Meshtastic. Highly extensible: Vision Master E290 has a rich set of pins and , which will allow you to expand widely. 2*20 Pin Female Header, perfectly compatible with for . High resolution display rich: The integrated E-Ink display has a high resolution of 128x296 pixels, and can show system status and parameters, making it convenient for users to use the development board for their own product design. USB/Battery interface: Onboard SH1.25-2 battery interface, integrated lithium battery management system (charge and discharge management, overcharge protection, battery power detection, USB / battery power automatic switching). (Due to different product batches, the appearance , which does not affect the use) Material: PC+Plastic colour: As shown Specification: C Package Contents: 1 x E-ink Display(470-510MHz) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.