There were two bugs in the board as created, which should be expected when it was created in such a short time. Once these bugs are fixed, you’ll have a fully functional Digispark clone that can be used for several projects. You can also attach leads to the open jumpers to get full access to all of the pins from the ATtiny85 to drive your own projects. Power is provided directly by the USB port when used as a USB device, by a USB charger, or via J2 at the top of the board.”]
Source: https://blog.talosintelligence.com/2019/08/talos-defcon-badge-build-instructions.html