Want to make one for your desk? All it takes is an Arduino Nano R3 or comparable microcontroller, an RGB LED ring with 12 LEDs, a 16×2 LCD, a buzzer, and a momentary push button switch.

The Arduino Nano itself is the most basic and oldest of ... As long as what you're building doesn't need to be squeezed into a tight case, you can likely use an Uno board for it.