The SRH240A Headphones from Shure provide excellent sound reproduction and comfort. With 40mm neodymium dynamic drivers optimized for general listening and monitoring, the SRH240A Headphones reproduce deep bass with clear mids and highs. The SRH240A's impedance, power handling and sensitivity are all calibrated for connection to most consumer and professional audio devices. Includes a threaded 1/4" (6.3 mm) nickel-plated adapter, and re-engineered headband and earcup construction to provide a more ergonomic, comfortable fit.