Behringer PRO-8 HA8000 Headphone Amplifier with HD 201 Stereo Headphones - Set of 2 Direct input connector on each channel for easy connection of any sound source Parallel Main outputs allow cascading of several headphones amplifiers XLR inputs and outputs featured on the rear panel so you can connect multiple HA8000 units for even greater listening capacity Ideal for stage and audio applications; accommodates the most discerning set of ears Includes: Sennheiser HD 201 Lightweight Stereo Headphones - Set of 2