Lady Gaga performed in Times Square on Saturday night and she was the mayor's special guest, helping him push the Waterford crystal button at 11:59 p.m. that signals the descent of the New Year's Eve ball.

WSJ: Mayor Goes Gaga for New Year's Kiss

Like the Arduino Leonardo it has a 16 MHz crystal oscillator, a micro USB connection, an ICSP header, and a reset button.

ENGADGET: Arduino Esplora helps you learn microcontrollers without the pesky breadboard