TEST Frends Headphones The Coupe Ear Buds with Mic. In ear headphone formed from solid aluminum; for iPhone and Blackberry compatible. Custom designed multi-function mic 3.5mm stereo plug Impedance: 16 ohm Cable Manager Custom tuned 10mm driver Frequency range 16-20.000 khz Tangle free durable TPE cord 1 khz sensitivity - 106 dB By Frends Headphones.