The CH3BF is the kind of headphone Sound contractors can feel good about selling to their customers. It is simple yet robust. It has quality one piece (not cheap seam welded) ear cushions, a high quality 1.2 meter woven cotton/polyester cable, Samarium cobalt drivers that deliver great intelligibility and a binaural wiring scheme that permits the headphone to work with basic mono jacked ALD's and stereo jacked models as well. IT IS NOT a stereo headphone. It's 32 ohm drivers are driven in series and shorted across both the ring and tip connection of its 3.5mm TRS plug. Mono audio is preferred by audiologists for ALD applications. The CH3BF delivers for practially all listening receivers. Custom plugs available on orders of 5K or more.