The Sennheiser HDR 170 wireless headphones deliver detailed output without the hassle of wires. These Sennheiser headphones feature an around-the-ear design that blocks the outside noise so that you listen to clear music without missing out on a single beat. Furthermore, the power button allows you to effortlessly switch on/off the Sennheiser HDR 170 wireless headphones. Also, you can control the volume while listening to your favorite music on these headphones. With a frequency response of 18 Hz to 21 KHz, these headphones output sound with stunning base effect. Moreover, you can listen to music on these Sennheiser headphones up to a distance of 260 feet without carrying the phone.