The Beyerdynamic DT 770 I headphones are ideal for personal music players, smartphones, and a variety of other audio devices. Rated at 16 Ohms and with a frequency range of 5Hz to 35kHz, the Beyerdynamic DT 770 headphones deliver optimal sound quality and superior audio definition. Additionally, the adjustable headband and closed-back-cup design ensure the headphones remain comfortable even when worn over long periods.