Vision Master E213 is an E-Ink development kit with multiple wireless communication options. Users can control the display via Bluetooth, Wi-Fi, and LoRa using the provided sample programs and development tools. The board features a default 2.13-inch black-and-white E-Ink display screen, capable of retaining the displayed image for up to 180 days after power loss. It is compatible with Arduino, PlatformIO, MicroPython, and other development frameworks, supporting applications such as electronic labels and identification tags. It can also run open-source projects like Meshtastic.Main Features: - ESP32-S3FN8 microcontroller with Wi-Fi and BLE support - Low power consumption: 20 µA in deep sleep mode - Retains display image for up to 180 days after power loss - Onboard SH1.25-2 battery interface with integrated lithium battery management system (charging, discharging, overcharge protection, battery level detection, and automatic USB/battery power switching) - Onboard 2.13-inch display with 250 × 122 pixel resolution, supporting partial refresh - Storage conditions: -25 °C to 70 °C, ≤45% RH - Optimal operating conditions: 0 °C to 50 °C, 55 ± 10% RH - Two SH2.0-4P sensor interfaces, compatible with QuickLink series sensors - Arduino-compatible with provided development frameworks and libraries Material: Plastic + PC Package Contents: - 1 × 2.13-inch E-Ink display (without LoRa module) Note: Appearance may vary slightly between production batches; this does not affect functionality. Lighting conditions and display settings may cause slight color variation between the product image and the actual item. Measurement tolerance: ±1–3 cm.