A9 3.5mm Port Adjustable Gaming HeadsetA9 3.5mm Port Adjustable Gaming Headset 1. Horn diameter: 40mm 2. Frequency range: 20-20.000hz 3. Microphone size: 6x2.7mm 4. Microphone sensitivity: -38dB+/-3dB 5. Directivity: Omnidirectional 6. Impedance: 2.2 ohm 7. Cable length: about 1.9m 8. Material: PVC 9. Input plug: 3.5mm 10. The omnidirectional noise reduction microphone can pick up sound very sensitivy, so you can have a clear chat with others 11. The microphone boom is very flexible, allowing you to adjust the position 12. Equipped with a 40mm audio driver, providing rich b, clear vocals and high-fidity stereo, very suitable for online courses, Skype chat, business work, conference calls, etc. 13. Ultra- call center headset with adjustable headband, suitable for all head types 14. Soft over-ear ear cushions and padded headbands are designed to provide a comfortable wearing experience and iminate pressure on the ears or head, enhancing comfort throughout the day 15. Plug and play, no need to install 16. There is a volume controller on the headphone cable, you can easily manage the volume increase or decrease