A stereo power amp with 50 Watts maximum output is required to provide signal to the HB1XL. There are separate, concentric volume controls for the left and right channels. Premium quality, sealed 2 Watt, audio taper pots provide reliability and precise level control. A stereo/mono switch combines left and right channels into both earpieces. Both ¼” and 3.5mm headphone jacks are provided. Parallel wired female and male XLR input/loop thru jacks can be used for "Daisy chaining" modules. A permanently attached belt clip provides a convenient method of attaching the HB1 for easy access to the controls.