Etymotic hf2. Interface type: 3.5 mm, Cable length: 1.2 m. Ear coupling: intraaural, Headphone frequency: 20 - 15000 Hz, Headphone sensitivity: 105 dB. Microphone sensitivity: 120 dB. Compatible products: - Android - Blackberry - Windows Phone - HP WebOS - Symbian - Apple iOS iOS. Volume control: Digital