Feature 1 Control Range: 7 band sound equalizer control range of 12dB. Equalization bands are 60Hz, 150Hz, 400Hz, 1KHz, 3KHz, 6.5KHz, 15KHz, composed of TI or ST TL074. 2 Basic Parameters: 7 band digital equalizer preamplifier gain, 4580 classic operational amplifier provides 5 times the amplification 14dB; input impedance of 20K, output impedance of 600. 3 Compatible: Dual channel digital equalizer ear amplifier part is composed of NE5532 type 47 headphone driver circuit, easy to drive a variety of types of headphones, adjustable high and low. 4 3.5mm Interface: Car digital equalizer is 3.5mm input interface supports 4 pole plug, the output is connected to a headset with microphone, which can be used for normal voice calls on cell phones, and the other terminal has a group connection port available. 5 Aluminum Alloy Material: Graphic car sound equalizer is made of premium aluminum alloy, high strength, corrosion resistance, stable performance, DC5V12V power supply, dual channel sound.Item Type: 7 Band Sound EqualizerMaterial: Aluminum AlloyPower Supply: DC5V-12VInterface Specification: 5.5x2.1Equalization Circuit Control Range: 12dbEqualization Frequency Band: 60HZ,150HZ,400HZ,1KHZ,3KHZ,6.5KHZ,15KHZ Package List1 x Equalizer1 x Power Supply Line1 x Adapter