TEST Frends Headphones The Lightwire Headphones with Mic. Lightweight designed on-ear headphones; for iPhone and Blackberry compatible. Custom designed multi-function mic, strain relief, and audio jack 3.5mm plug stereo Impedance: 32 ohm Custom tuned 40mm driver Frequency range 20-20.000 khz Tangle free durable TPE cord 1 khz sensitivity - 103 dB By Frends Headphones.