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 600Ω. 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, DC5V‑12V power supply, dual channel sound. Specification: Item Type: 7 Band Sound Equalizer Material: Aluminum Alloy Power Supply: DC5V-12V Interface Specification: 5.5x2.1 Equalization Circuit Control Range: ±12db Equalization Frequency Band: 60HZ,150HZ,400HZ,1KHZ,3KHZ,6.5KHZ,15KHZ. Package List: 1 x Equalizer1 x Power Supply Line1 x Adapter