The SENNHEISER's HD26 PRO closed back audio monitoring headphones are designed for use in radio, television, and other broadcast environments. They feature Sennheiser's switchable ActiveGard technology, which protects your hearing by restricting audio peaks above 105dB and passive noise attenuation to reduce background noise. The headphones' cord and cushions may be turned out and replaced, and the headphones have a modular construction. There is a 1/4" adaptor supplied.