HIFIMAN is an established market leader in full-size planar magnetix headphones as well as in-ear phones. The missing piece in the puzzle has been an on-ear model. That is until now.Enter the Edition S Open/Closed Back On-Ear Dynamic Headphones. In the companys long-established tradition of creating remarkable performance for the price the Edition S establishes a new benchmark for others to follow. FeaturesHigh performance - With a sensitivity rating of 113dB and impedance of 18 ohms the Edition S can be driven by most portable audio devices and it sounds simply great doing it!Open/closed back design - HIFIMAN gives you the best of both worlds with an on-ear headphone that can go from one more to the other simply by adding or removing the logo cap on the ear cup.Portable and foldable - Only 8.74 ounces the Edition S can be easily folded and stored in its supplied travel case.