Absolutely brilliant light fixture! I use two of these master-slave -synced in sound active mode, and for a basic 100-150 people party that's all you need. Full potential is unleashed with sound active mode, without a DMX controller, as they pick the sound and respond accordingly (AUTOMATICALLY change direction/colour as bassdrum kicks, and slow down the rotation when the tune breaks down). I've found two drawbacks; if you play a little louder or the device is positioned in a way that the internal mic pics bass very easily, it's hard to adjust the sensitivity to a low enough setting. And if you wish to use them as part of a larger setup, I haven't found a way to use DMX for toggling them on to sound active mode, and still keep them synced with each other. However, DMX-toggle works fine with a single unit, of course. Using a power switch is not a feasible option, as they take several seconds to start up.