CoreInk is a main control device with an E-Ink display launched by for , using the ESP32--D4 controller. The front is embedded with a 1.54inch E-Ink display with a resolution of 200x200, supporting black/white display. Compared to ordinary LCD screens, the E-Ink display provides a better text reading experience, with features such as low power consumption and image retention when powered off. For human-machine interaction, it offers a rotary switch and physical buttons, integrated LED indicator, and buzzer. It has a built-in 390mAh lithium battery, combined with an internal RTC (BM8563) to achieve timed sleep and wake-up functions, providing excellent battery life. There are power and reset () buttons on the left side and bottom of the device, making it easy to use and debug. It offers a variety of peripheral interfaces (HY2.0-4P, M-BUS, HAT module interface) to expand sensor devices, providing infinite possibilities for subsequent application development. SoC ESP32--D4,240MHz dual core,600 DMIPS,520KB ,Wi-Fi Flash 4MB Flash Input Voltage 5V @ 500mA Interface Type-C x 1, HY2.0-4P x 1, M-BUS bus female connector, top HAT expansion interface E-Ink Display GDEW0154M09, SPI interface, 200 x 200@1.54inch, Dpi:184, 1-bit black/white display (grayscale: 2) Viewing area (mm): 27.6x27.6, Dot pitch (mm) 0.138x0.138, Refresh time (s) 0.82, Partial refresh time (s) 0.24 Physical Buttons Programmable button x1, Reset button x1, Power button x1 LED Green LED x 1 RTC BM8563 Buzzer Passive buzzer x1 Antenna 2.4G 3D antenna Pinout G25, G26, G36, G23, G34, G18, G21, G22, G14, G13 Battery 390mAh@3.7V (The product printed words depending on the batch, but this does not affect use) Color: White Material: plastic Package Contents: 1 x CoreInk 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.