Feature:1. [2.5mm Plug]‑2.5mm business headset, plug and play, no driver required, easy to use. Suitable for devices with 2.5mm headphone plug2. [Clear Voice]‑Boom style microphone freely twistable for best level. Noise cancelling technology makes your voice clear even in noisy environments.3. [Comfortable To Wear]‑Dual ear telephone headphone has a soft ear cushion for comfortable positioning accuracy.4. [More Durable]‑Traffic headset adopts quality structure and materials making this call center headset sturdier and more durable.5. [Compatible Scenes]‑Headset for phone sales, telephone counseling services, hospitals, banks, telecom operators, enterprises, etc.How to Use:Plug and playSpecification:Item Type: 2.5mm Office HeadsetMaterial: ABSModel: H390D-2.5Colour: BlackType: BinauralPlug: 2.5mm PlugFunction: CallScope of Application: For devices with 2.5mm headphone plugSpeaker Parameters:Sensitivity: 105±3dB (at 178mV 1KHz)Voice Coil Impedance: 150±15Ω (at 1KHZ)Frequency: 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: 200Hz-6KHzCurrent Consumption: 100-500υA Package List:1 x2.5mm Office Headset