HamiltonBuhl Ear Bud Headphone Design - In-ear design Cord - 4' long cord Ear_Cushions - Soft foam ear cushions Speaker size: 13mm Impedance: 32 ohms Rate/Max Power: 30mW Sensitivity: 99dB @1,000 Hz Frequency Response: 20-20,000 Hz Plug: 3.5mm, single stereo Cord: 4&#039; Prop 65 Certified