Features Support for the UNO 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 if your program and communicatings over USB, otherwise you can use all 6 even if you are programming via USB 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 Specifications Model: 21-0503 material: metal Colour: Black Size: 26.8 x 19.3mm Package Included: 1 x micro usb development board