Feature:1. Speaker sound volume adjustment + microphone mute + 6‑speed line sequence adjustment, 180° rotating head card, 330° swing arm microphone.2. The ultra‑comfortable phone headsets are equipped with soft protein artificial leather ear pads, which are user‑friendly and hygienic.3. The adjustable headband is suitable for different head sizes. The earmuffs can be rotated and worn all day.4. Wideband audio solutions provide natural and clear hearing. Anti‑acoustic shock can block sudden sounds to protect hearing.5. Business‑grade broadband headsets can achieve clear calls and acoustic shock protection, can be used for phones in call centers and offices.How to Use:Plug and play.Specification:Item Type: Telephone HeadsetMaterial: ABSRotatable Head Card 180°Rotatable Swing Arm 330°Speaker Parameters: Sensitivity: 105±3dB(178mV 1KHz)Impedance: 150±15Ω（1KHZ）Frequency Characteristics: 100Hz-10KHzDistortion: ≤5% (at 178 mV 1KHZ)Microphone Parameters:Directivity: Single PointSensitivity: –40±2dB(2.0V,2.2KΩ,1KHz)Distortion: ≤5%(4.5V 2.2KΩ 1KHZ)Frequency Characteristics: 200Hz-6KHzCurrent Consumption: 100-500υA Application:Suitable for devices that can be connected to RJ9 interface, very suitable for skype chat, business, call center, conference call, listening and speaking, long-speaking, online courses, web seminars, etc.Package List:1 x Telephone Headset1 x Manual