The Plattan headphone was designed to be the perfect classic headphone, utilizing innovative functions and performance with today"s technology. It is a full size headphone allowing for rich, secluded sound. You can fold it down to the size of your fist for maximum mobility. Plattan also comes with a ZoundPlug on the earcap, allowing for a friend to plug in and enjoy your music. Frequency Response - 20Hz-20kHz Impedance - 60O Sensitivity - 115dB Max Input Power - 40mW