Feature: 1. Noise Reduction Microphone: The headset has a built in voice noise reduction processor, adopts ENC noise reduction technology, and uses intelligent voice algorithms to eliminate background noise. 2. Ergonomic Design: Firm and durable, the boom can be rotated 180°, and the microphone rod can be rotated 330°, making the voice output smoother and the call clearer. 3. Adjustable Microphone Rod: The headset adopts an adjustable microphone rod, which can be freely bent inside and outside to achieve precise adjustment of the microphone position. 4. Volume Control: USB headset supports one key mute, volume adjustment. Sample rate conversion, equalization, dynamic range control and acoustic sound cancellation and sound signal processing are optimized for speech environments. 5. High Quality Steel Headlines: The telephone headset is retractable and adjustable, adapting to the size of the head, freely retractable without rowing, reducing oppression and easy adjustment. Specification: Item Type: Telephone Headset Material: ABS Ambient Temperature: -10℃-+40℃ Relative Humidity: 10%-90% Atmospheric Pressure: 86~106Kpa Environmental Noise: ≤60dB(A) Sensitivity: -40±3dB (0dB=1V/Pa, at1KHz) Impedance: 2.2K Ohms Distortion: ≤5% Sensitivity: 100±3dB. Package List: 1 x Telephone Headset1 x Manual