Dexim iGroove. Interface type: 3.5 mm. Ear coupling: intraaural, Headphone frequency: 20 - 20000 Hz, Headphone sensitivity: 112 dB. Compatible products: iPhone 4/3GS/3G, iPad 1/2, iPod Touch 4G/Touch 3G/ Touch 2G/Touch 1G. Compatibility: Telephone, Volume control: Digital