Breadboard power supply. Plugs into a standard full or half-sized breadboard and does not get in the way or block any of the central breadboarding area. Feed 7-12V into the barrel connector. Gives two output supplies. Both switchable between 5V and 3.3V. Also a 5V mini USB output and a protective polyfuse. You can also power it from the 5V mini USB. Red indicator LED shows when powered up.