E290 (HT-VME290) is an E-Ink development kit with multiple wireless drive methods. This board is equipped with a default 2.90-inch black-white E-Ink display screen, continuous display for 180 days after power outage. It is compatible with for Arduino, PlatformIO, 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. NOTE: You need to flash the meshtastic firmware yourself. ESP32-S3R8 MCU, support Wi-Fi and BLE. LoRa module compatible with Mashtastic. Low power consumption, 18uA in deep sleep, continuous display for 180 days after power outage. 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). Onboard 2.90 inch 296 x 128 pixels display, support for partial refresh. Storage condition: -25 ~ 70, 45%RH. Optimal operating condition:0~50, 5510%RH. SH2.0-4P sensor interface is perfectly compatible with QuickLink series sensors. 2 x 20 Pin Female Header, perfectly compatible with for Raspberry PI. Compatible with for Arduino. Color: As shown Material: PCB Specifications:433-510mhz Different batches may have different printing screens, but it does not affect the use Package Contents: 1 x Devboard 1 set of accessories (accessory colors are random, Not accepting designation) 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.