Car use: The EQ equalizer has a built-in isolated boost power supply to signal purity and dynamic range; because it is an isolated power supply, it can also be used on the board without worrying about common ground interference Low noise: The signal processing circuit of the 3-band EQ equalizer uses TI NE5532 inductive operational amplifier, HIFI high fidelity, low noise Synchronous input and output: The mini stereo preamplifier uses NE5532 circuit for pre-attenuation compensation. The attenuation is -15db when the power is off. When powered on, NE5532 amplifies and compensates, and the gain is 0db. At the same time, the device reduce the interference of noise and make the sound more pleasant Volume control: The 3-band EQ has left and right channel balance adjustment, volume control, high, medium and low three-band balance adjustment; mute circuit, almost no impact sound after power on and off Widely compatible with all : The stereo EQ equalizer input is suitable for electronic devices, turntables, sound cards, guitars, bass, electronic musical instruments, game consoles or other devices. The output is suitable for speakers, subwoofers, sound enhancers, reverberators, AV receivers, post amplifiers, headphones, etc. Colour:Black Material:Aluminum Alloy Package Contents: 1 * EQ Equalizer 1 * Power Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.