[] With the ESP-32, the Watch supports a variety of development options (for Arduino, Micropython, ESP-IDF, Zephyr-RTOS, etc.) and has a large community of makers/tinkerers. [ ] Use Wi-Fi and Bluetooth LE connections to connect Internet APIs (Weather, News, Traffic, Maps, Spotify, etc.) and Bluetooth LE devices. [] Featuring open source hardware and software, a variety of examples and cool watch faces, and 3D case designs. [] Its display is power-efficient, only consuming power when updating, and remains clearly visible even in direct sunlight. [] Has IO ports for users to connect various sensors, such as heart rate and oxygen monitors. & 12304;Specification& 12305; [] Ultra-low power e-paper 1.54-inch display with 200 x 200 resolution and wide viewing angle [ ] Wi-Fi and Bluetooth LE connectivity [] 3-axis accelerometer with gesture detection [] Real-time clock with calendar and alarm functions for accurate timekeeping [] Built-in USB to serial port adapter, can be programmed anytime and anywhere [] Vibration motor for alarm clock [] Four buttons (use imported buttons, better feel) [] Open source hardware and software [ ] Tons of examples and cool watch faces [] Open source 3D shell design [] Built-in 3.7V 200mAh battery [] Using PCB upper and lower covers can better protect the screen, battery and various components on the motherboard.