The Zoom ZHA-4 is an extremely practical tool for all kinds of production, recording and rehearsal situations. With its help, the line or headphone output of any audio device can be distributed to up to 4 headphones. Each headphone output of the ZHA-4 has its own volume control as well as a mute switch for muting. The ZHA-4 can be powered either by a separately purchased USB-C power supply or a power bank or by battery. It is therefore also ideally suited for use "in the field".