Dual-magnetic dual-cavity dynamic unit creates a subversive acoustic experience:D-Fi is equipped with a customized dual-magnetic circuit dual-cavity dynamic unit, which has better energy efficiency and stronger transient performance than ordinary magnetic circuits. It also has the characteristics of low impedance and high sensitivity, and can be driven more easily. Innovative and precise tuning :The traditional tuning is achieved through dampers. But there is no way to accurately control a certain frequency band through dampers. Using an innovative circuit board adjustment , each frequency band can be accurately controlled according to our target curve. Taking into account a variety of music styles, it is easy to achieve accurate HIFI sound quality:The of dynamic headphones, classic U-shaped tuning. The low frequency is clear and powerful, the tension and relaxation are natural, the human voice is rich, natural and accurate, and the high frequency shows the sound details, making D-Fi a leader in dynamic headphones. Outstanding and unique:The frequency response range of headphones is an important parameter to measure the quality of a headphone. It refers to the width of the frequency band that the headphones can broadcast. The frequency response width of most headphones on the market is only between 20Hz-20000Hz. The frequency response width of D-Fi can reach 20Hz-40000Hz. Therefore, D-Fi has a deep enough low-frequency dive and excellent high-frequency performance. Sensitivity: 1103dB Plug type: 3.5mm Cable: Double parallel silver-plated wire Impedance: Tuning type 29-48Q Frequency response range: 20-40000Hz Pin type: 0.75mm Cable length: 1205CM Colour:As Shown Material:Metal Type:A:Without Microphone Package Contents: 1x In-ear wired headphone set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.