Feature:1. NOISE CANCELLING MICROPHONE: Headphone with flexible high definition microphone; less noise, clearer sound, and clear conversations in noisy environments.2. ALL DAY COMFORT: Ultralight headphone with soft ear pads and a flexible headband will not put a strain on your ears for long lasting comfort, ensuring you stay focused on your work.3. EASY TO USE: 3.5mm corded phone headset, plug and play, no drivers required, convenient to use. And comes with a long headphone cable for flexibility on the move.4. COMPATIBLE: Telephone headset is compatible with devices with 3.5mm jacks for home, office, call center, telemarketing, customer service, conference calls, and more.5. DURABLE CONSTRUCTION: Business earphone has a sturdy construction, high quality ABS material, to ensure super performance and long lasting.How to Use:Plug and play.Specification:Item Type: Telephone HeadsetMaterial: ABSModel: H390 3.5Color: BlackType: Single EarPlug: 4 Sections Single 3.5mm (Small Straight Head)Function: CallScope of Application: Compatible with Devices with3.5mm 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: Single PointSensitivity: -40±2dB (2.0V, 2.2KΩ, 1kHz)Distortion: ≤5% (at 4.5V 2.2KΩ 1kHz)Frequency Characteristics: 200Hz-6kHzCurrent Consumption: 100-500µA Package List:1 x Telephone Headset