7 Equalization bands, could be adjustable from -12 to + 12db. The Subwoofer frequency is in 30Hz to 120Hz adjustment. Powered at 12 Volts with 6-channel Front, Rear and Subwoofer aux stereo output which enhances your sound experience in the car. makes your amplifier and speaker receive a but clear signal. Allowed CD and Aux (2 channel) input with gain knob to adjust aux volume, also a CD & AUX input button could switch flexibly to another mode input. Flexible control as your favor, subwoofer volume control, subwoofer frequency control, fader control, each various Hz control. This car equalizer is supplied by DC 12V . Besides, strong metal chassis with high quality knobs for all controls to enhance your tips . Material:Metal colour:Black Package Contents: 1 * Car Audio Equalizer Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.