The function of the EQ equalizer is to support two audio input modes, 4-channel audio input, and allocate two subwoofer output channels, front left and right channels, rear left and right channels, a total of six channels output. The two subwoofer outputs can be adjusted through the panel for subwoofer frequency points and subwoofer volume adjustment. At the same time, the panel adjustment function can be used to adjust the frequency gain of the simulated four channels in the seven frequency bands of the audio frequency range of 63Hz to 12kHz, so that customers can repair and adjust the audio and timbre effects of the post-stage power amplifier, and greatly improve the control performance of the entire sound effect. Colour:black Material:Metal + Plastic The actual product may have slight color difference or difference, which will not affect the use Package Contents: 1 * 7 Band Car Equalizer 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.