KitSound Audio Cable Knit Headband for iPod, iPhone, iPad Mini and MP3 Player - Pink Chunky cable knit design / Super-soft lining for ultra comfort 3.5mm Jack Plug Frequency response: 40 Hz - 18 kHz / Sensitivity: 103 dB Adjustable speakers for the perfect fit / Water and sweat-resistant drivers Compatibility - Most Smartphones / Tablets / MP3 Players Most devices which have a 3.5mm Jack Sockets.