Yamaha CM500 Headset with Built-In Microphone Combines closed-ear, noise-reducing headphones with a sensitive electric microphone Creates the ideal choice for audience-interactive DJs or school music labs Crafted with high-impact materials and an ultra flexible headband Withstands repetitive twisting and hard use found in music labs and on the dance floor Frequency Response: 20Hz - 20kHz Frequency Response: 20Hz - 20kHz Impedance: 120 ohms Sensitivity: 96dB/mW Mic Range: 100 Hz - 20 kHz Jacks: 1/8" and 1/4" adaptor