Feature:1. [Noise Cancelling] Phone headset with HD microphone, which can be twisted at will; less noise, making your voice louder and clearer, and clear conversations in noisy environments.2. [Comfortable] The headphone is ultra lightweight with soft ear cushions and a flexible headband that will not burden your ears. Make sure you concentrate on your conversation with long lasting comfort.3. [Multi Functional] USB wired telephone headset, plug and play, no driver required. Support speaker volume adjustment, volume mute, microphone mute. Long headphone cable, more flexible to move.4. [Good Compatibility] Universal business headphone, suitable for devices with USB interface. Ideal for home, offices, call centers, telemarketing, customer service, conference calls, and more.5. [Sturdy And Durable] Telephone headset has a sturdy construction, high quality ABS material design, high hardness, wear resistant, ensuring super performance and making it durable.How to Use:Plug and play.Specification:Item Type: Telephone HeadsetMaterial: ABSModel: H390D USB 2Color: BlackType: BinauralPlug: USB PlugFunction: Call, Support Speaker Volume Adjustment, Volume One Key Mute, Microphone MuteScope of Application: For Devices with USB InterfaceSpeaker Parameters:Sensitivity: 105±3dB (at 178mV 1kHz)Voice Coil Impedance: 150±15Ω (at 1kHz)Frequency Characteristics: 100Hz-10kHzDistortion: ≤5% (at 178mV 1kHz)Microphone Parameters:Directivity: Single PointSensitivity: -40±2dB (2.0V, 2.2KΩ, 1kHz)Distortion: ≤5% (at 4.5V 2.2KΩ 1kHz)Frequency Characteristics: 200Hz-6kHzCurrent Consumption: 100-500µA Package List:1 x Telephone Headset