Feature:1. [Noise Cancellation] The headset has a built in high definition microphone that can be twisted at will to provide clear conversations even in noisy environments. Less noise and clearer sound.2. [Ultra Lightweight] The traffic headset provides you with an ultra lightweight wearing experience for long lasting wearing comfort. Soft ear pads and flexible headband don't put any burden on your ears.3. [Easy to Use] The single ear customer service headset has a USB plug, plug and play, no driver required, and easy to use. Support speaker volume adjustment, microphone mute, strong practicability.4. [Rugged Construction] The earphones are designed with sturdy construction and materials to ensure super performance and make them durable. The long headphone cable provides flexibility on the move.5. [Wide Compatibility] The headset is suitable for devices with a USB interface, ideal for home offices, call centers, telemarketing, insurance, customer service, conference calls, and more.How to Use:Plug and PlaySpecification:Item Type: HeadsetModel: H390-USB-1Material: ABSColour: BlackType: MonoauralPlug: USB InterfaceFunction: Call, Support Speaker Volume Adjustment, Microphone MuteScope of Application: Suitable for Devices with a USB InterfaceSpeaker Parameters:Sensitivity: 105±3dB (at 178mV 1KHz)Voice Coil Impedance: 150±15Ω (at 1KHz)Frequency Characteristics: 100Hz to 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 Phone Headset