This is app uses an Arduino Uno, an open source microcontroller (*Open Source - microcontroller and software for which the original source code is made freely available and may be redistributed and modified). Arduino Unos are microcontrollers used by millions of people around the world. You can also use an Arduino Mega, ESP32 or many other microcontrollers to control home made Disco Lights. They are controlled using Bluetooth, either a separate module like a HM-10 BLE and has 8 sequences which can be increased. It also has has a speed control. My version uses an open source Arduino Uno, HM-10 BLE Bluetooth device and a 5V 8-Channel Solid State Relay board. All the boards are available on eBay, TEMU, AliExpress and many other sites. The Arduino forums have a an enormous knowledge base of open source projects for you to learn electronics and programming. I designed the entire project and they work flawlessly. Happy Aduinoing!