This allows you to do things like use the tone generator while punching numbers into the wattage calculator, all the while illuminating your trunk with the flashlight! DD Toolbox features: -Wattage/ Ohm's Law Calculator for determining your systems actual output wattage and impedance -Tone generator that ranges from 20Hz to 20kHz -DD Box calculator which uses DD's exclusive enclosure design theory to make a recommendation for maximum bass in your given enclosure space -Flashlight function that's able to be toggled on/off from any screen.