Heavy Duty Noise Reduction Headset E1909

Heavy Duty Noise Reducation Headset Built of Acrylonitrile Butadiene Styrene (ABS), the dome of the speaker is hard, durable and heat-resistant. Though the sturdy material of the speakers are a bit weighty, the Velcro taped headstraps with which you wear the headset relieves much of the weight and provides adjustable, comfortable wearing experience. MIC type: dynamic Dimension: φ13.0 x 4.5mm Sensitivity: -89 ± 3dB (0dB-1v/bar at 1KHz) Directivity: super cardioid Frequency: 400Hz to 8KHz Impedance: 150Ω ±20% at 1KHz Operation voltage: 1.5 to 10V