Full-Open Design Full-Open Design for outstanding stereo soundstage. The sound drivers are positioned further back in the earcups, ie. a little further from your ears to give a more spacious sound and greater listening comfort. Acoustic Bass Lens Newly developed extra-large driver unit with "Acoustic Bass Lens". Acoustic Bass Lens works with a new diaphragm structure to deliver incredibly deep bass, comparable to closed headphones. Oversized 50 MM Diameter Sound Driver The Sound drivers are larger than most headphones for noticeably deeper bass, lower distortion and wider dynamic range; frequency response extends down to an amazingly low 10 Hz. Neodymium Magnets for maximum energy and minimum size; provide increased sensitivity and ultra-high definition sound reproduction. Impedance Compensator Unlike other full-open headphones, the MDR-F1 requires no amplifier impedance matching; built-in equalization circuitry eliminates the variations in sound quality caused by amplifier impedance differences . Magnesium alloy frame and super Duralumin headband Die-Cast Magnesium Alloy Frame and Super Duralumin Headband for the full-open design combines light weight with extreme resistance to flexing and resonance  Ecsaine pads  Leatherette Head and Earpad with"Ecsaine" material are durable, yet luxurious to the touch.  Double Headband distributes weight evenly for added comfort, even after you've listened for hours on end

Contents .. Sony MDR-F1 with Gold-plated stereomini plug Stereomini to Stereo Gold-plated plug adapter Supplied by Authorized Resellers in Japan. 1 year Japan Warranty from the day we sent your parcel. We can help you liaise with the maker in Japan. You will pay for postages to/from our Japan office. Singapore and Malaysia buyers can bring/post to us locally. We will deliver FREE to/from Japan. Return postage chargeable.   Type Open, Dynamic Driver Size 50mm Frequency Response 10~30,000 Hz Sensitivity 100dB/mW Impedance 12ohm Output 700mW Cord Length, Shape 3.5m, Left Weight 200g Weight in Retail box 700g