The Analog Output Power Display is just a module that indicates via LEDs whether there is power on the ±12 V rails. It provides front panel accessible test points for measuring the rail voltages, and a front panel power header that permits easy power connection for a module being tested or undergoing trouble shooting. It is a non Kosmo standard width of 20 mm, because that is the space available in my case, and a non AO standard color of black, because black.