Feature 1CONTROL RANGE: The 7 band equalizer circuit has a control range of 12dB. equalization bands: 60Hz, 150Hz, 400Hz, 1KHz, 3KHz, 6.5KHz, 15KHz, by TI or ST TL074. 2BASIC PARAMETERS: 7 band sound equalizer preamplifier gain, 4580 classic op amp provides 5x amplification (14dB); input impedance is 20K, output impedance is 600. 3COMPATIBLE HEADPHONES: The ear amplifier part of the sound equalizer consists of NE5532 type 47 headphone driver circuit, easy to drive various types of headphones, adjustable high and low, with sound cable. 43.5MM INTERFACE: 3.5mm input interface supports 4 pole plug, the output terminal connects to a headset with microphone, which can be used for normal voice calls on a cell phone, and the other terminal has a Qunlian interface for choice. 5ALUMINUM ALLOY MATERIAL: The 7 band car sound equalizer is made of aluminum alloy, high strength, stable performance, DC 512V power supply, dual channel sound.Item Type: 7 Band EqualizerProduct Material: Aluminum AlloyColor: BlackPower Supply: DC 512VInterface Specification: Approx. 5.5x2.1mm / 0.2x0.1inEqualization Circuit Control Range: 12dbEqualization Band: 60HZ, 150HZ, 400HZ, 1KHZ, 3KHZ, 6.5KHZ, 15KHZ .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Equalizer1 x Adapter1 xSoundCable