Digispark Kickstarter ATTINY85 Mini Module DC 5V Micro USB Development Board for Arduino IDE 1.0+ OSX/Win/Linux Features: Support for Arduino IDE 1.0+ (OSX/Win/Linux). Power via USB or External Source - 5V or 7-35V (automatic selection). On-board 500mA 5V Regulator. Built-in USB (and serial debugging). 6 I/O Pins (2 are used for USB only) 8k Flash Memory (about 6k after bootloader). I2C and SPI (vis USI). PWM on 3 pins (more possible with Software PWM). ADC on 4 pins. Power LED and Test/Status LED (on Pin0). Specification: Working Voltage: DC 5V Size: About 26 X 18.5 X 3mm/1.02 X 0.73 X 0.12" Notes: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 2. Please allow 1-3mm measuring deviation due to manual measurement.