The M5Stack CoreInk Development Kit features a distinctive 1.54-inch E-ink display with 200x200 resolution, delivering crisp black and white visuals that remain visible even when powered off. At its core, the ESP32-PICO-D4 processor runs at 240MHz dual-core with 520KB of RAM, providing robust computing power for diverse applications. The device includes a 390mAh lithium battery, multi-function buttons, and status LED indicators for intuitive control. With its built-in BM8563 real-time clock and deep sleep capabilities, it's optimized for power efficiency. The CoreInk offers versatile connectivity through multiple expansion ports including TypeC, HY2.0-4P, and M-BUS female connector, enabling seamless integration with external sensors and modules. The compact unit measures 56x40x16mm and weighs just 32g, making it highly portable. Operating in temperatures from 0°C to 60°C, it features 4MB flash storage and supports Wi-Fi connectivity. The device includes practical additions like a passive buzzer and a 2.4G 3D antenna, while its plastic construction ensures durability for development projects. Precautions: Please avoid long-time high-frequency refresh when using it. The recommended refresh interval is (15s/time). Do not expose to ultraviolet rays for a long time, otherwise it may cause irreversible damage to the ink screen. The low-power power management solution adopted by CoreInk is different from that of CORE and StickC devices. When in use, the PWR button is used as a power-on button(long press 2s). If you need to shut down the device, you need to use the software API or press the reset button on the back.