Feature:1. FOR CAR USES: EQ equalizer built in isolated booster power supply to ensure signal purity and dynamic range Because is an isolated power supply, can also be used on board, without worrying about common ground interference2. LOW NOISE: The signal processing circuit of the 3 band EQ equalizer uses for TI NE5532 induction level operational amp, HIFI high fidelity, low noise3. COINCIDENT INPUT AND OUTPUT: Mini stereo sound preamp adopts NE5532 circuit for pre attenuation compensation. When power is off, the attenuation is -15db. When power is on, NE5532 amplifies and compensates, and the gain is 0db. At the same time, the device will reduce the interference of noise and make the sound more pleasing to the ear4. VOLUME CONTROL: 3 band EQ has left and right channel balance adjustment, volume control, high, medium, low three segment balance adjustment Mute circuit, almost no impact sound after power on and off5. WIDELY COMPATIBLE WITH ALL SOUND DEVICES: Stereo EQ equalizer inputs fit electronics, turntables, sound cards, guitars, basses, electronic musical instruments, game consoles or other devices. Output suitable for speakers, subwoofers, sound blasters, reverbs, AV receivers, post amps, headphone, etc.Specification:Item Type: Stereo EQ EqualizerPower Supply: DC5VPower Consumption: 0.5WInput Output Interface: JackFrequency Response: 20HZ-20KHZGain: 12dbEqualization Range: and15dbInput Impedance: 50KOutput Impedance: 600Material: Metal.Package List:1 x Equalizer1 x Data Cable