Feature: 1. [Noise Reduction] Telephone headset with high definition microphone can be twisted at will, allowing you to speak clearly in a noisy environment, with less noise and clearer sound. 2. [Comfortable Design] The soft ear cushions and flexible headband will not cause any burden on your ears, provide you with an ultra light wearing experience, and ensure you concentrate on your conversation. 3. [Easy To Use] Wired business headset, RJ9 plug, plug and play, no driver required, support for speaker volume adjustment, microphone mute, six speed line sequence adjustment, easy to use. 4. [Flexible And Durable] The headphone adopts a sturdy structure and material design to ensure super performance and make it durable, the long cord allows you to move more flexibly. 5. [Widely Compatible] Suitable for devices with RJ9 headphone jacks, it is an ideal choice for home, offices, call centers, telemarketing, customer service, teleconferences, etc. Specification: Item Type: Telephone Headset Material: ABS Model: H360-RJ9-MVA Color: Black Type: Single Ear Plug: RJ9 Crystal Head Function: Call, Speaker Volume Adjustment, Microphone Mute, Six Speed Line Sequence Adjustment Scope of Application: Used for Devices with RJ9 Headphone Jack Speaker Parameters: Sensitivity: 105±3dB (at 178mV 1kHz) Voice Coil Impedance: 150±15Ω (at 1kHz) Frequency Characteristics: 100Hz-10kHz Distortion: ≤5% (at 178mV 1kHz) Microphone Parameters: Directivity: Single Point Sensitivity: -40±2dB (2.0V, 2.2KΩ, 1kHz) Distortion: ≤5% (at 4.5V 2.2KΩ 1kHz) Frequency Characteristics: 200Hz-6kHz Current Consumption: 100-500µA. Package List: 1 x Telephone Headset