No, it isn't Lead, nor is it Peanut Butter. It is the 'B' version of the prolific ATmega328P microcontroller which started all this maker craziness off! Top view of PB Pro Mini Description This is a minimal microcontroller board with only a voltage reg, crystal, I2C pull-ups, LEDs and the chip itself. The goal here is to reduce costs while hosting the beefy 328PB! This is based on, and pin compatible with, the Arduino Pro Mini 5v/16MHz from Sparkfun . Notable, not-so-minor improvements for the 'B' version: 2 UARTs 2 I2Cs (TWI) 2 SPI Qtouch 5 Timers (with OC, IC, and PWM) Everything else is about the same. You should be aware the clock driver on the chip is a low-power version, but this board and crystal operate at 16MHz just fine at 5V. The Arduino library I've been using for the PB has been working without a problem! Getting Started You'll need a FTDI Friend or FTDI Cable to program this as there is no secondary USB