Feature:1. Clear Dialogue: The telephone headset has a built in HD microphone that can be twisted at will; make your voice clear. Provides clear dialogue even in noisy environments.2. All Day Comfort: The phone's soft ear cushions and flexible headband, ultra lightweight design ensure you focus on your conversations for long lasting wearing comfort.3. Plug and Play: 3.5mm business headset with 3.5mm angled plug; plug and play, no driver required, easy to use. Support speaker volume adjustment, microphone mute.4. Rugged Construction: The earphones are designed with sturdy construction and materials to ensure super performance and durability. The long headphone cable provides flexibility on the move.5. Wide Compatibility: The traffic headset is suitable for devices with 3.5mm headphone jack, home, office, call center, telemarketing, insurance, customer service, conference calling, etc.How to Use:Plug and PlaySpecification:Item Type: Telephone HeadsetModel: H390 3.5MVMaterial: ABSColour: BlackType: MonauralPlug: 3.5mm Plugs(Small Straight)Function: Call Speaker Volume Adjustment Microphone MuteScope of Application: for use with devices with a 3.5mm headphone jackSpeaker Parameters:Sensitivity: 105±3dB (at 178mV 1KHz)Voice Coil Impedance: 150±15Ω (at 1KHz)Frequency Characteristics: 100Hz-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 Telephone Headset