Main FeaturesStandard Warranty: 1 YearManufacturer/Supplier: Califone International, IncManufacturer Part Number: HPK-1020Manufacturer Website Address: www.califone.comBrand Name: CalifoneProduct Line: TitaniumProduct Model: HPK-1020Product Name: Titanium HPK-1020 HeadphoneMarketing Information: Introducing the most technically sophisticated and durable headphone ever manufactured by Califone. This Titanium series Mac amp; PC compatible stereo headphone will help optimize differentiated learning experiences with breakthroughs in safety, performance, comfort and durability. Built to help students not only learn content material, the HPK-1020 is also designed to teach them about appropriate volume listening levels when using a headphone. By integrating Sentinel Technology into the earcup, the volume playback level is restricted to the ASHA-recommended maximum of 85 decibels for safe listening practices (this feature can be disarmed for students with special needs).Product Type: HeadphoneConnectivity Technology: WiredCable Length: 6 ftSound Mode: StereoImpedance: 50 OhmMinimum Frequency Response: 20 HzMaximum Frequency Response: 20 kHzFeatures: Sleep Mode, Detachable Cable, Noise CancellingEarpiece Design: Over-the-headEarpiece Type: BinauralDriver Size: 1.57Host Interface: Mini-phoneMaterial: ABS, Polyurethane, Polyvinyl Chloride (PVC)Form Factor: Ear-cup