Feature:1. [Easy To Use] QD quick plug, compatible with for Jabra, for Beien. Answering is easily turned on off at the touch of a button for your needs.2. [Built in HD Mic] Single sided ear headphone has a built in HD microphone to make your voice clearer on call.3. [Comfort and Endurable] PCmonaural headset is very comfort, endurable and smart designed for professional office and contact center's users.4. [Ultra Lightweight] Ultra lightweight design ensures you concentrate on your conversation for long lasting wearing comfort.5. [For Scenes] Monaural headset is suitable for home offices, call centers, telemarketing, insurance, customer service, conference calling and more.How to Use:Plug and playSpecification:Item Type: QD Business HeadsetMaterial: ABSModel: H390-QDColour: BlackType: MonauralPlug: QD quick plug, compatible with for Jabra, for BeienSpeaker 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 xQD Business Headset