DT-990-PRO-250 is an open-back studio reference monitor headphone headset from Beyerdynamic. With a frequency range of 5Hz-35KHz and maximum frequency of 35 kHz, this headphone ensures you receive a clear and detailed sound. This headphone has a 250 ohm impedance which enables you to listen to your audio at high levels without compromising on the quality. It features an adjustable headband and an open back to ensure comfortable usage and long listening sessions.