Brand:  Sony Model Name:  MDRZX310R Color:  Red Form Factor:  On Ear Connectivity Technology:  Wired About this item Folding mechanism of its own that can be compact size Quick folding mechanism adopted simple, easy to carry Model: Dynamic Sealed Driver diameter: φ30mm Playback frequency: 10 ~ 24000Hz Impedance: 24Ω Output sound pressure level (sensitivity): 98dB Plug: 3. 5mm stereo mini plug Code: 1. 2m Weight: about 125g I (except cable)