The HPC-A30 Closed-Back Studio Monitor Headphones from Polsen are designed for monitoring audio in studio, field, mobile, and DJ applications. They feature 50mm drivers that provide a frequency response of 18Hz to 22kHz for accurate reproduction of your audio. The ear cups on the HPC-A30 have an around-ear (circumaural), closed-back design, allowing for the increased isolation often desired while tracking or monitoring playback. Additionally, the ear cups can be pivoted for single-ear monitoring. A padded and adjustable headband provides comfort during extended use. The 32 ohm impedance allows for ample volume when used with mobile devices. The headphones have a single-sided, 9.8-foot cable that terminates in a 3.5mm stereo connector. A 1/4" adapter is included for additional compatibility. Type: Circumaural Ear Cup: Closed back Driver: 2" (50 mm) Impedance: 32 ΠSensitivity: -93 dB ±3 dB (@ 1 kHz/mW) Maximum Power: 600 mW Distortion: <5% @ 1 kHz Frequency Response: 18 Hz to 22 kHz Cable Length: 9.8' (3 m) Weight: 6.5 oz (184 g)