The Technical Pro HPB820 Professional Headphones are used to pump out one of the highest quality sound outputs and are built with an enhanced noise reducing design. This phone is also built with a Dynamic Super Bass driver. This driver is meant to properly reproduce that big full sound right inside your ear. You will be able to hear those low, thumping frequencies. Included is a portable headphone carrying case designed for safe storage. The 1/4" adapter helps to connect this headphone to other MP3 player or other component with an 1/8" input. FeaturesDynamic Super BassContoured body for superior comfortLightweight design and air tight constructionAdvanced design for serious music loversProfessional super bass driverSuper Cushioned ear padsPortable headphone case designed for safe storageEnhanced noise reducing designSpecificationsEar Pads: Super Cushioned ear padsDriver Unit: 50mm / 1.96 inchesImpedance: 32ohmSensitivity: 105dB �±3dBFrequency Response: 20Hz-20KHzMagnet: NdFedPlug: 3.5mm Stereo plugMaximum power input: 100mwAdaptors included: 1/4'' adapterCord length: 12ft / 3.65 mWeight: 5 lbs / 2.26 kg