The Zoom ZHA-4 is the perfect for mobile recording setups and podcasting. It 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 battery-powered device, lasts 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 inch stereo aux cable is also included.