Perfect for mobile recording setups and podcasting, the Zoom ZHA-4 Handy Headphone Amplifier lets up to four people monitor audio from their headphones, dictating their own levels all the while. Four headphone outputs are on hand, as are four individual volume knobs to control levels, and four individual mute buttons. 

This is a battery-powered device, lasting between 3.5 and 4.5 hours on a single pair of AA batteries. However, you can also power it straight from portable power packs over USB Type-C. A 19" stereo aux cable in included with your purchase of the Zoom ZHA-4.