Digispark Pro

Compatible with Arduino IDE 1.5 (OSX/Win/Linux)
USB development, USB device emulation, USB-CDC virtual serial port emulation
16MHz AVR MCU - 16MHz crystal
16KB Flash memory capacity (14.5K+ after bootloader)
Communication and debugging via serial USB
14 I/o Pins (2 shared with USB)
I2C, SPI, UART, LIN, and USIA
ADC on 10 pins
3 PWM Channels (can be assigned)
Power supply via USB, or external source - 5v or 6-16v (via voltage regulator)
Integrated 500ma 5V Voltage Regulator
Power LED and Test/Status LED (on Pin 1)
Access to solder jumpers to disable LEDs, and other features for reduced power consumption
Two mounting holes