Product Description Features: One die casting zinc alloy tone can extend the high frequency range and stabilize the low frequency effect. Exquisite color treatment process for zinc alloy surface with Rose Gold Rose. Ergonomics design ensures that headphones are safe and easy to fall off. Three different sizes of size adaption to the ear diameter. OFC oxygen free copper wire transmission, which can be tensile and anti entangling. Separate line control with wheat, built-in multifunctional button and microphone. Standard 3.5mm audio gold plating interface. Sensitivity: 95+/-3dB Impedance: 1kHz/16 Omega Frequency response: 20~20000Hz