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 , 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 . Compatible with for . Color: 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.