To answer your question I have taken some text from the "about" section of the Model 200 web page:

"...in general use we’ve made it easy for you to use the Model 200 by providing two ways to turn it on:

A trigger jack is provided for automatic turn-on when the Model 200 is used with products such as our Model 950 preamp/processor or Model 1050 receiver that output a low voltage control signal. For use with non-Outlaw products (SHAME ON YOU!), the Model 200 also features a “music sense” circuit that automatically turns the unit on when an audio signal is present, and turns it off within ten minutes after the audio signal stops."

Also, there is a mistake in the information that will be corrected shortly. The Model 200 is 1 rack unit high making it 1 3/4 inches tall.