The CoreInk is a compact and efficient e-ink display module in the M5Stack Core series, powered by the ESP32-PICO-D4. It features a 1.54-inch 200x200 black-and-white e-ink screen, ideal for comfortable long-term viewing thanks to its eye-friendly, low-power display technology that retains images without power.

Designed for versatility, CoreInk includes a multi-function button, physical button, status LED, and a buzzer for user interaction. It also packs a 390mAh LiPo battery, BM8563 RTC for accurate timekeeping, and deep sleep support for ultra-low power use. With independent reset and power buttons, plus expansion ports for external sensors, CoreInk is perfect for building custom low-power IoT and display projects.