The Koss KTXPro1 is a lightweight, adjustable headphone that provides portability with great titanium sound. The adjustable headband provides a comfortable, secure fit while on the move. Features an inline volume control and open, hear-through sound.The KTXPro1 titanium layered diaphragm delivers accurate sound reproduction for the full Sound of Koss. With a frequency response of 15-25,000Hz for high quality sound performance. Equipped with a straight, 4-foot dual-entry cord, and an 3.5mm plug with 6.3mm adapter, the KTXPro1 is perfect for home and portable use. The open foam ear cushions provide an open, hear-through sound.Avoid using headphones with the volume turned up for an extended period of time. Doing so can damage your hearing. It is advisable to keep the volume at a moderate level at all times. For your own safety, please do not use when driving or cycling.