Feature: 1. This headset has a 330‑degree rotating arm microphone and a 90‑degree rotating head clip, so it is capable of turning to different wearing shapes, thus convenient for different wearing angles. 2. Broadband audio solution can maintain clear calls for you even in a noisy environment. What's more, anti‑acoustic technology can protect your ear from overloud sound. 3. Business‑Grade broadband headset is equipped with acoustic protection technology as well as digital signal processing technology, thus it can achieve more clearer calls. 4. Adoption of soft protein artificial ear cushions and an adjustable headband, with these designs above, users will not feel uncomfortable for long‑term wear. 5. Every part of the earphone is made of high‑quality materials, so it is light and durable, and the reinforcement line is designed for Kevlar, which can withstand harsh environments. Specification: Item Type: Telephone Headset Material: ABS Rotatable Swing Arm 330° Rotatable Head Clip 90° Speaker Parameters: Sensitivity: 105±3dB (At 178mV 1kHz) Impedance: 150±15Ω (1kHz) Frequency Characteristics: 100Hz-10kHz Distortion: ≤5% (At 178 mV 1kHz) Microphone Parameters: Directivity: Single Point Sensitivity: –40±2dB (2.0V, 2.2KΩ, 1kHz) Distortion: ≤5% (At 4.5V 2.2KΩ 1kHz) Frequency Characteristics: 200Hz-6kHz Current Consumption: 100-500υA Application: Suitable for USB-Connected devices, for Windows 2000/7/8/10 / XP / Vista, for OS X Book and most of the leading UC platforms and soft phones. Very suitable for Skype chat, business, call center, conference call, listening and speaking, dragon talk, online courses, web seminars, etc.. Package List: 1 x Telephone Headset1 x Manual