KZ ZSX 12-unit Ring Iron Metal Gaming In-ear Wired Earphone, Standard Version 1. Material: metal + plastic 2. Two sets of DWEK medium and high frequency moving irons are combined with a 30095 high frequency moving iron, which has paper-blowing resolution and reproduces the real sounds of different instruments 3. Ergonomic design, comfortable to wear 4. Through reasonable cavity structure settings, the sound channel of each unit is delicately balanced. The depth of the longitudinal sound field is appropriate, and the details are rich and durable 5. The 2 Pin interchangeable line design brings more room for expansion to the headset, and can be expanded to upgrade the Bluetooth headset 6. Aluminum alloy outlets to ensure the sound integrity of each outlet 7. Cable length: 1.25+-0.04m 8. Impedance: 24 ohms 9. Sensitivity: 111db 10. Plug type: 3.5mm 11. Pin type: 0.75mm 12. Frequency response range: 7-40000Hz 13. Sounding principle: ring-iron mixing (1DD+5BA)