Convenient Connectivity: 7 Band Equalizer Car Sound Features a 3.5mm input interface supporting 4 pole plugs and a microphone output, making it ideal for use with cell phones and other audio devices.Construction: 7 Band Equalizer Car Sound Crafted from high-strength aluminum alloy, providing and stable performance, suitable for car or home audio systems.Precise Control Range: 7 Band equalization circuit control range 12db with equalization bands at 60hz,150hz,400hz,1khz,3khz,6.5khz,15khz, providing precise adjustment for optimal sound quality.Versatile Compatibility: 7 Band Equalizer Car Sound Equipped with ne5532 ear amplifier for all types of headphones, adjustable high and low frequencies to suit individual preferences.Enhanced Amplification: 7 Band Equalizer Car Sound Preamplification gain with 4580 classic op amp offers 5 times amplification (14db), ensuring powerful and clear audio output.