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. Specification: Item Type: RJ9 Single Ear Headset Material: ABS Colour: Black Type: Monaural Plug: RJ9 Crystal Plug Function: Call, Speaker Volume Adjustment Scope of Application: For devices with RJ9 headphone plug Speaker Parameters: Sensitivity: 105±3dB (at 178mV 1KHz) Voice Coil Impedance: 150±15Ω (at 1KHZ) Frequency: 100Hz to 10KHz Distortion: ≤5% (at 178mV 1KHZ) Microphone Parameters: Directivity: Unidirectional Sensitivity: -40±2dB (2.0V, 2.2KΩ, 1KHz) Distortion: ≤5% (at 4.5V 2.2KΩ 1KHz) Frequency: 200Hz to 6KHz Current Consumption: 100 to 500υA. Package List: 1 x RJ9 Single Ear Headset