Frequency Range: 22Hz - 17.5 kHz</br>Sensitivity (@ 1kHz): 105dB SPL/mW</br>Impedance (@ 1kHz): 16 Ohms</br>Weight: 30grams (1oz)</br>Includes a Fit Kit?? Carrying Case?? and Wax Rem"l Tool</br></br>Product Description</br></br>The SCL2 is an excellent introduction into premium audio via sound isolation. The SCL2 features single dynamic microdrivers for full sonic range and resonant bass.</br></br>Amazon.com</br></br>An excellent introduction to premium audio via sound isolation?? the discrete?? comfortable and affordable Shure SCL2 earphones in clear use Shure's award-winning earphone technology for a rich response across the full sonic range. Utilizing Shure's award-winning earphone technology?? they're great for use on live stages as well as with any home or portable audio device in noisy environments such as bus stations?? airports?? and more. The SCL2 earphones feature Single Dynamic Micro Driver technology that delivers full range sound and isolation from outside noise. <p> <table align=left width=300 cellpadding=10> <tr><td><img  src="://images-na.ssl-images-amazon.com/images/G/01/musical_instruments/detail-page/shure-SCL2-clear-hero.jpg" border=0  align=top width=290 height=255><br><br><small><i><b>Shure's sound-isolating SCL2 earphones in clear.</b></i></small></td></tr> </table> Sound isolating earphones provide sound quality far beyond the technical ability of the most expensive earbuds and isolation that's superior to the best headphones. By creating a secure fit between the sound source and your ear canal?? unwanted background noise is blocked out while the music comes straight in. <p> They provide a comfortable fit thanks to the three sizes of three different included sleeves--orange foam?? clear and gray flex. Experiment with the size and style that creates the best fit for you--a good seal is key to optimizing sound isolation and bass response as well as maximizing comfort during extended wear. A durable and compact carrying case is included with the SCL2 to provide a convenient?? tangle-free solution to store your earphones. <p>  <p>Sound Isolating Technology</p> <table align=right width=400 cellpadding=10> <tr><td><img  src="ps://images-na.ssl-images-amazon.com/images/G/01/musical_instruments/detail-page/shure-feature-isolation.jpg" border=0  align=top width=369 height=318></td></tr> <tr><td><img  src="https://images-na.ssl-images-amazon.com/images/G/01/musical_instruments/detail-page/shure-SCL2-sleeves.jpg" border=0  align=top width=400 height=205></td></tr> </table> Headphones generally enclose your ear or rest on top of it. Regular earphones (like the earbuds often packaged with CD players) sit on the outside of the ear. Sound isolating earphones are different. They are designed to fit inside your ear canal?? where they create an isolated listening area that is responsible for their superior acoustic properties. <p> Sound isolating earphones were originally developed as Personal Monitor Systems to allow musicians to hear their own performances in loud onstage environments. Sound isolating earphones work by using soft?? pliable sleeves to block background noise?? allowing small?? high-performance drivers to deliver incredibly precise sound directly to the ear.  <p> <b>Is isolation different from noise cancellation?</b><br> The seal created by a sound isolating earphone physically blocks most frequencies of background noise. Active noise