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Sony Foldable Headphones MDR-ZX310 R - Metallic Red Folding mechanism of its own that can be compact size Quick folding mechanism adopted simple, easy to carry Model: Dynamic Sealed Driver diameter: f30mm Playback frequency: 10 ~ 24000Hz Impedance: 24O Output sound pressure level (sensitivity): 98dB Plug: 3. 5mm stereo mini plug Code: 1. 2m Weight: about 125g I (except cable) AO