Feature:1. With Noise Cancelling Microphone: The telephone headset has a built in HD microphone, which can be twisted at will; make your voice clear, with less noise and clearer sound.2. Applicable: The headset is suitable for devices with RJ9 headphone jack. Ideal for home, offices, call centers, telemarketing, insurance, customer service, conference calls, and more.3. Strong Structure: The traffic headset features a sturdy structure to ensure super performance and durability. The long headphone cable provides flexibility on the move.4. Volume Adjustment: Single ear customer service headset with RJ9 plug, plug and play, no driver required, easy to use. Support speaker volume adjustment.5. Comfortable to Wear: The RJ9 business headset's soft ear cushions and flexible headband, ultra lightweight design ensure you focus on your conversation, with long lasting wearing comfort.How to Use:Plug and PlaySpecification:Item Type: RJ9 Single Ear HeadsetMaterial: ABSColour: BlackType: MonauralPlug: RJ9 Crystal PlugFunction: Call, Speaker Volume AdjustmentScope of Application: For devices with RJ9 headphone plugSpeaker Parameters:Sensitivity: 105±3dB (at 178mV 1KHz)Voice Coil Impedance: 150±15Ω (at 1KHZ)Frequency: 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: 200Hz to 6KHzCurrent Consumption: 100 to 500υA Package List:1 x RJ9 Single Ear Headset