Feature:1. This phone headset is compatible with devices that can be connected to the RJ9 interface, 330° rotatable head card, 330° rotatable swing arm.2. Enable a clear listening experience, built in noise cancelling microphone to reduce background noise, acoustic shock protection to protect hearing.3. With ultra lightweight fit and adjustable headband to fit all head sizes, soft leatherette ear cushion enhance all‑day wearing comfort.4. Reinforced wires are designed by for to withstand harsh environments and prevent office chair wheels and objects from everyday use.5. Uni‑body headband construction, premium speaker and microphone make this office phone headset sturdier and more durable.How to Use:Plug and play.Specification:Item Type: Binaural HeadsetMaterial: ABSApplication: Suitable for devices that can be connected to the RJ9 interface, ideal for Skype chat, business, call centers, conference calls, listening and speaking, long-speaking, online courses, web seminars, etc.Rotatable Head Card 330°Rotatable Swing Arm 330Speaker Parameters:Sensitivity: 105±3dB (At 178mV 1KHz)Voice Coil Impedance: 150±15Ω (1KHz)Frequency Characteristics: 100Hz-10KHzDistortion: ≤5% (At 178mV 1KHz)Microphone Parameters:Directivity: UnidirectionalSensitivity: -40±2dB（2.0V, 2.2KΩ, 1KHz）Distortion: ≤5% (At 4.5V 2.2KΩ 1KHz)Frequency Characteristics: 200Hz-6KHzCurrent Consumption: 100-500υA Package List:1 x Binaural Headset1 x Manual