Feature:1. Broad Compatibility: Our high quality noise cancelling call center headsets are compatible with call center wired telephone equipment, landline phones and other equipment with RJ9 ports. Strong compatibility, sturdiness and comfort.2. Headset Suitable For Office/home Landline Phone: Very suitable for people who answer a lot of calls every day, working at home and office, call center, telemarketing, customer service users, telephone staff, online education, training, after sales service.3. Adjustable Noise Reduction Microphone: The 150 ohm speaker ensures perfect sound quality. The noise proof microphone increases speech clarity. It adopts hearing protection technology and the microphone's noise reduction capability reaches the level of aviation noise reduction.4. The Most Comfortable Headphones: Ultra lightweight mobile phone headset with adjustable headband, suitable for all head sizes, flexible microphone to meet your preferences, soft high quality ear cushions, can improve all day wearing comfort.5. Flexible And Durable: The 330° flexible Mic can be easily adjusted according to your needs. Precise design, high quality materials, integrated headband structure, and high quality microphone make this call center headset with microphone more sturdy and durable.How to Use:Plug and playSpecification:Item Type: HeadphoneMaterial: ABS, MetalFrequency Response: 20-20khzImpedance: 150ΩSensitivity: 125dbMaximum Input Power: 10MWPlug: RJ9 Crystal HeadLength: Approx. 1.2m/3.93ft Package List:1 x Headphone