Feature: 1. ERGONOMIC: Call center headphone is ergonomically designed to make voice output smoother and calls clearer, boom can be rotated 180 degrees, microphone can be rotated 330 degrees, stable and durable. 2. RETRACTABLE HEADBAND: Business headset has a high quality manganese steel headband, adjustable retractable, arbitrary expansion does not scratch the hand, and thus adapt to the size of the head, easy to adjust and reduce stress. 3. NOISE CANCELLING: Customer service headset built in voice noise reduction processor, using ENC noise reduction technology, using intelligent voice algorithms to eliminate background noise. 4. ADJUSTABLE MICROPHONE POLE: The microphone pole of USB headset is adjustable and can be freely bent inside and outside to achieve precise adjustment of the microphone position, thus making it suitable for each person to wear. 5. SOUND ADJUSTMENT: Office headset allows for mute and volume control, supporting one touch mute, volume adjustment, optimized sample rate conversion, equalization, dynamic range control and acoustic cancellation, as well as sound signal processing for voice environments. How to Use: Plug and Play Specification: Item Type: Customer Service Headset Material: ABS Ambient Temperature: ‑10°C to +40°C Relative Humidity: 10% to 90% Atmospheric Pressure: 86 to 106Kpa Ambient Noise: ≤60dB(A) Sensitivity: ‑40±3dB(0dB=1V/Pa,at1KHz) Impedance: 2.2K Ohm Distortion: ≤5% Sensitivity: 100±3dB Package List: 1 x Customer Service Headset 1 x Instruction Manual