It fits a tiny OLED and an LED strip. Use it to display whatever you can think of.
Used with an LED strip, 0,96" OLED and a Wemos D1 mini.
I've got it connected to Tibber(electricity company) API to display current energy price and current energy usage and light up more LEDs to show live usage.
You can use it with any other API, simply write some code and have fun!
The author hasn't provided the model origin yet.