The Koss KTXPro1 is a lightweight adjustable headphone that provides portability with great titanium sound. The adjustable headband provides a comfortable secure fit as you travel to work home or anywhere in between. The inline volume control and open hear-through sound provide the convenience in portable music. The KTXPro1 titanium layered diaphragm delivers accurate sound reproduction for the full Sound of Koss. With a frequency response of 15-25 000Hz the KTXPro1 produces high quality sound performance. Equipped with a straight 4-foot dual-entry cord and an 1/8 in. and 1/4 in. adapter the KTXPro1 is perfect for home and portable use. The open foam ear cushions provide an open hear-through sound. The KTXPro1 is covered by the No Questions Asked Lifetime Warranty.