It works great allowing the outside patio to listen to a different source then the inside of the bar. Vikings game on the inside & Packers on the patio. It combines the ZC3 & ZC6 so there's one less device needed & it saves you a little money. If it was a rotary dial for the volume control it would get five stars because you know the volume level just by looking at the dials position. With the push button there's no easy way to know the volume level before you turn it on.