The Duetto-KD6BT is a set of wireless ultra-mini, high quality aluminum alloy earbuds with an in-line microphone and control. Designed by our engineers with over 25 years of experience in the world of live professional audio. The earbuds are each equipped with a 6mm performance-enhanced, carbon-coated full-range transducer to provide amazing output capable of reproducing the frequency range from 5 Hz to 23 kHz ensuring the highest quality and fidelity of audio reproduction.