Features: 1. The seven stage balanced adjustment range is ± 12dB, composed of TI or ST original TL074 circuit. 2. Composed of seven frequency bands: 60Hz, 150Hz, 400Hz, 1KHZ, 3KHZ, 6.5KHZ, and 15KHZ. The knob is located in the middle as the origin, counterclockwise for attenuation, and clockwise for elevation. 3. Regarding frequency specifications, 60Hz is for deep bass, 150Hz is for low bass, 400Hz is for mid bass, 1KHZ is for mid bass, 3KHZ is for mid high, 6.5KHZ is for high, and 15KHZ is for ultra high. Adjustments should be made based on personal listening preferences. 4. Pre amplification gain: The 4580 classic operational amplifier provides 5x amplification (14dB). 5. The earphone amplifier adopts a 47 type headphone driver circuit composed of two NE5532, which can easily drive various types of earphones from 16 ohms to 600 ohms. 6. Input impedance 20K, output impedance 600 ohms. 7. The 3.5mm input-output interface supports a 3-pole/4-pole plug, and the earphones with microphone can make normal voice calls on the phone. It is suitable for gaming enthusiasts and music enthusiasts, and there is also a terminal with a lotus interface available for selection. Parameter: Voltage: DC5-12V Power interface: 5.5 * 2.1 interface Audio interface: Lotus RCA be careful: 1. Input 3.5 cannot be used simultaneously with the lotus mouth, only one can be selected. Output 3.5 can be used simultaneously with the lotus mouth. 2. It can be powered by a power bank or high-quality charging head, and impure power supply may cause communication noise. Package include: 1X host 1X power cord