HamiltonBuhl SchoolMate Deluxe Stereo Headphone Gray with 3.5mm Plug The HA7 is a 4-in-1 design operates on 1/4 stereo 1/8 stereo and 1/4 mono and 1/8 mono. Use in groups with a listening center jack box. Impedance: 170 Ohms. Frequency response: 18-20k Hz. Cord: 3 meters. Cushions: Leatherette, replaceable Design: Deluxe, over-ear Speaker drivers: 40mm Frequency response: 50-20,000 Hz Impedance: 32 Sensitivity: 105dB4dB Compatible with:<ul class="a-unordered-list a-vertical"> iPods / iTouches / MP3 Players iPhones / Cell Phones / Mobile Devices iPads / Tablets / eReaders Chromebooks Computers (Mac &amp; PC) CD Players / Stereos, TVs Most Gaming Systems Anti-Lice Storage Bag: Heavy-duty, write-on, moisture-resistant, reclosable bag. Helps prevent the spread of lice! When sealed in the bag, lice are killed in 24-48 hours without the use of chemicals. 180 angle with 3.5 mm TRRS stereo plug Cord: 5&#039; Dura-Cord - chew-resistant, PVC-jacketed, braided nylon Prop 65 Compliant