E-ink watches are nothing new. The Watchy happens to be an open source E-ink watch ready for your custom projects. You can customize it with 3D printed cases and watch straps. Watchy’s E-Ink display is always on and has a 200 x 200p resolution. It comes with WiFi and Bluetooth connectivity.
Watchy has a 3-axis accelerometer with gesture detection. It has a USB to serial adapter for programming and 4 tactile buttons. You can find out more about it here.