One should not expect miracles, but for the money you get a super 2.1 sound system. The on-off switch is located on the right speaker. Just as the controller for the volume and the bass. The bass is very good and clear. Overall, the system is very bassy. Depending on what you been up to (listening to music, watching movies, etc.) you have to adjust the bass again and again. But is not so bad, because the controller is very easy to reach. Too bad that no regulator for treble this is. Top price-performance ratio. I think it's better than his little brother (Z323) also by far. Can also be used as a sound system for a TV.
