Utrasone HFI-2400 Open-Back (Discontinued by Manufacturer)<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Safer hearing</li><li>Open back， circum-aural headphones</li><li>Frequency range 10-25，000 Hz</li><li>Impedance 75 Ohm</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41m%2Bq1X41bL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41qvpKUOdlL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51LXqgSrLfL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51BuaxoSDsL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51LphZmt57L.jpg" noproxy>