In the words of Disaster Area Designs:

MIDI Baby 3 builds on our popular and ultra-tiny MIDI Baby. MIDI Baby 3 works like three MIDI Babies in a single enclosure three footswitches, three LEDs, triple the programmability.

Connect MIDI Baby 3 to your computer using the supplied USB cable, then launch our intuitive web configuration tool. You can then configure MIDI Baby 3 to send a wide variety of useful MIDI messages, configure its inputs and outputs, and even change the LED colors for each function.