Sony's XBA-4 comes with 'Made in Japan' micro size Quad Balanced Armature Drivers with Woofer, Tweeter and Super Woofer units. The epitome of superior sound quality, it brings to your ears a rich expression across all frequencies, from profound bass to bright and detailed high frequency sound.  
<li>Quad Balanced Armature Full Range + Woofer + Tweeter + Super Woofer</li><li>Made in Japan Balanced Armature Driver</li><li>Rich expression across all frequencies</li><li>Profound bass with bright and detailed high frequency sound</li><li>Double-Layered Housing</li><li>Noise Isolation</li><li>Hybrid silicone rubber earbuds (SSx2, Sx2, Mx2, Lx2), Noise isolation earbuds (Sx2, Mx2, Lx2), Cord Adjuster (winds cord up to 50cm) x 1, Carrying Case x 1, Operating Instructions x 1</li>