Cresyn C515H Blue - Product DescriptionFeaturesUltra Light weight Adjustable Head Band Dynamic Sound with Deep Bass SpecificationType: Open air, dynamic Driver Units: ø 40 mm Frequency Response: 20 Hz ~ 20 kHz Impedance: 32 ? Sensitivity: 97 dB/mW Max Power Input: 500 mW Cable Length: 1.2 m Plug Type: -ø 3.5 mm Stereo plug Weight: 71 g (Without cord) resyn C515H Blue - SpecificationsOrder Code 2821 Barcode 8808323003829 Connector Type 3.5mm Cable Length (m) 1.2 Cable Type Symmetrical Impedance (ohm) 32 Frequency Response (Hz) 20-20000 Sound Pressure Level (dB) 97 Max. Input Power (mW) 500 Form Supra-aural Ear Cup Closed back Driver Type Dynamic Driver Diameter (mm) 40 Compatibility All iPhone"s, All Ipods, All Standard MP3 Players