Feature:1. Wide Compatibility: Our high quality noise cancelling call center headsets are compatible with call center wired telephone equipment, landlines, and other devices with RJ9 ports. Strong compatibility, strong and comfortable.2. Noise Cancelling Microphone: The 150 ohm speaker adopts hearing protection technology, and the noise cancelling capability of the microphone reaches the level of aviation noise reduction. It is equipped with a noise cancelling microphone.3. Comfortable Headphones: Ultra light phone headset with adjustable headband for all head sizes, flexible microphone to suit your preferences, soft high quality ear cushions for improved all day wearing comfort.4. Flexible: 330° adjustable, sophisticated design, integrated headband structure is more durable. It supports external volume control and microphone switch, which is very convenient. The cables are retractable and prevent tangling.5. Usage Scenarios: Ideal for people who receive a lot of calls every day, home and office work, call centers, telemarketing, customer service users, phone workers, online education, training, after sales service. Perfect for online classes, Skype chats, conference calls and more.How to Use:Plug and PlaySpecification:Item Type: Phone HeadsetMaterial: ABSLine Length:Before Unstretched: Approx. 1.5m/4.9ftAfter Stretching: Approx. 2m/6.6ftFrequency Response: 20 to 20KHzImpedance: 150ΩSensitivity: 125dBPlug: RJ9 Crystal Head Package List:1 x Phone HeadsetNote:Please allow some errors due to manual measurement.