Feature:1. HD Noise Reduction: Telephone headset has a built in HD microphone, providing clear conversations even in noisy environments. Can be twisted at will.2. Comfortable to Wear: RJ9 business headset features soft ear cushions and a flexible headband with an ultra lightweight design to ensure you focus on your conversation with long lasting wearing comfort.3. Easy to Use: Business headset has an RJ9 plug; plug and play, no driver required, easy to use. Supports speaker volume adjustment and microphone mute.4. Flexible and Durable: Communication headset is designed with robust construction and materials to ensure superb performance and make it durable. Long headset cable provides flexibility for mobility.5. Applicable: Call centre headset is suitable for devices with an RJ9 headset interface. Ideal for home offices, call centres, telemarketing, insurance, customer service, teleconferencing, etc.How to Use:plug and playSpecification:Item Type: Call Center HeadsetMaterial: ABSColour: BlackModel: H390-RJ9-MVType: MonauralPlug: RJ9 Crystal HeadFunction: Talking, Speaker Volume Adjustment, Microphone MuteScope of Application: for Devices with RJ9 Headset ConnectorSpeaker Parameters:Sensitivity: 105±3dB (at 178mV 1KHz)Voice Coil Impedance: 150±15Ω (at 1KHZ)Frequency Characteristics: 100Hz-10KHzDistortion: ≤5% (at 178 mV 1KHZ)Microphone Parameters:Directivity: Single PointingSensitivity: -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 Call Center Headset