Review on 🔧 Ximimark Set of 3 ATTINY85 General Micro USB Development Boards for Arduino by Michael Keitt

These boards are different from regular Arduino boards. You are actually telling the Arduino IDE to load the program before you connect them. The software then prompts you to connect the device, after which the program is immediately available for download. This is because the board only programs for a few seconds right after you turn it on, then does what it was programmed to do and doesn't stop programming until you unplug it and plug it back in at the right time. Time.