The SE535LTD utilizes a dedicated tweeter and dual woofers to deliver spacious sound with rich bass. Two detachable remote + mic cables enable you to connect to Apple products or other music-enabled phones. Sound Isolating sleeves in multiple sizes provide up to 37 dB of isolation, and a wide assortment of accessories offer premium customization. Evolved from personal monitor technology road-tested by pro musicians and fine-tuned by Shure engineers, SE535LTD earphones in limited-edition red deliver an unparalleled listening experience, allowing you to hear the details of your music like never before. Frequency response: 18 Hz - 19,5 kHz. Sensitivity: 119 dB SPL / mW. Colour: Red.