Idance Funky 600-Watt-Channel Recording Studio Equipment , White and Purple GET LOUD and CLEAN, Funky Form Factor,Dual Driver for Music Lover, Prenium Ear cup, Compatible with iphone, inline microphone. Driver Unit: 40mm Impedance:32Ohms, Driver Unit: 15mm Impedance:8Ohms, Driver Type: Neodymium, Sensitivity: 108dB+/-3dB Frequency Response: 15Hz~20KHz, Cord Length: 1.5m, Cable Type: PVC, Plug: 3.5mm gold chrome.