1. Control range: 7-band equalization circuit with a 12dB control range. Equalization frequency bands: 60Hz, 150Hz, 400Hz, 1KHz, 3KHz, 6.5KHz, 15KHz, utilizing TI or ST TL074 components. 2. Basic parameters: 7-band sound equalizer preamplifier gain using the 4580 classic operational amplifier provides 5X amplification (14dB). Input impedance is 20K, output impedance is 600. 3. Headphone compatibility: NE5532-based balanced headphone amplifier designed for 47 earphone driver circuits, capable of driving various headphones with adjustable output. 4. 3.5mm interface: 3.5mm input supports 4-pole plug; output connects to headset with microphone, compatible with standard mobile phone voice calls. Includes RCA terminal output. 5. Aluminum alloy construction: 7-band audio equalizer housed in durable aluminum alloy material offering high strength, corrosion resistance, and stable performance. Operates on DC 5V12V power supply with dual channel audio output. Suitable for use with car audio systems, mobile phones, computers, game consoles, and other devices. Color: Black Material: Metal Package Contents: 1 x Headphone Amplifier Mixer Note: Light reflection and display differences may cause slight variations between the product color in images and actual color. Measurement may vary by +/- 1-3cm.