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