SMAKN&reg; Digispark Kickstarter ATTINY85 Mini USB Micro Development Board for Arduino Support for the Arduino IDE 1.0+ (OSX/Win/Linux). Power via USB or External Source - 5v or 7-35v (12v or less recommended, automatic selection). On-board 500ma 5V Regulator. Built-in USB. 6 I/O Pins (2 are used for USB only if your program actively communicates over USB, otherwise you can use all 6 even if you are programming via USB).