Combining closed-ear, noise-reducing headphones with a sensitive dynamic microphone, CM500 creates the ideal choice for audience-interactive DJs or school music labs. Crafted with high-impact materials and an ultra flexible headband, its solid construction withstands repetitive twisting and hard use found in music labs and on the dance floor. Specifications: Frequency Response 20 Hz - 20 kHz Impedance 120 ohms Sensitivity 96 dB/mW Mic Range 100 Hz - 20 kHz Mic Impedence 600 ohms Jacks 1/8" plug