Axess HP610-BK High quality headphones with rotatable ear cups, compatible with all 3.5mm port smartphones, tablets and audio devices (Black) Folding and rotating joints for easy storage; Stereo headphones for great sound quality Audio universally compatible with all 3.5mm port smartphones, tablets and audio devices Impedance: 32 ohms; Driver: 40mm Sensitivity: 105dB/mW; Frequency response: 25,000Hz Maximum input power: 3,500mW; Cord: 4ft; Plug: 3.5mm audio jack