Adafruit Trinkets are tiny microcontroller boards that are Arduino-IDE programmable and built around the Atmel ATtiny85, a little chip with a lot of power. The Trinket is small enough to fit into any project and low cost to use without hesitation. The Attiny85 has 8K of flash, and 5 I/O pins, including analog inputs and PWM 'analog' outputs. A USB bootloader allows the Trinket to plug into any computer for reprogramming over a USB port, just like an Arduino. 

Two versions of the Trinket are available, a 3V and 5V. Use the 3V for sensors and devices that need 3V logic, 5V for sensors and devices that need 5V logic. The Trinkets can be powered with a LiPo battery and the 3V version should only run at 8MHz. The 5V version can run at 8MHz or at 16MHz by setting the software-set clock frequency. 

Even though the Trinket can be programmed using the Arduino IDE, it's not a fully 100% Arduino-compatible.

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