Visit Amazon sites : br Yamaha CM500 Headset with Built In Microphonebr br Combines closed-ear noise-reducing headphones with a sensitive electric microphone br Creates the ideal choice for audience-interactive DJs or school music labs br Crafted with high-impact materials and an ultra flexible headband br Withstands repetitive twisting and hard use found in music labs and on the dance floor br Frequency Response 20Hz - 20kHz br Impedance 120 ohms