SENNHEISER CC 500 Series CC 510 Easy Disconnect Connector Single Ear Single-Sided Headset Cord Length: 3.3 feet Headphone Frequency Response: 300Hz-3.4KHz Headphone THD: Less than 1% Headphone Input Impedance: 300 ohm Headphone Sensitivity: Max. 103 dB limited by ActiveGard Weight: 0.4 Package Contents: CC 510 Headset Carry bag Colored identification clips (3) Leatherette ear pad Single sided headband with side support Acoustic foam ear pad Clothing clip Microphone windscreen