Features: car audio graphic equalizer with variable gain adjustment and high level speaker input, very practical in use. With 6-channel front, rear and subwoofer aux stereo output which enhances your sound experience in the car. That makes sure that your amplifier and speaker receive a powerful but clear signal. Allowed CD-and-Aux (2 channel) input with gain knob to adjust aux sound, also a CD-and-Aux input button could switch flexibly to another mode input. Flexible control as your favor, subwoofer sound control, subwoofer frequency control, fader control, each Hz control. Specifications: Power supply: DC12V Maximum output voltage: 8V RMS Leveling range: 12dB Subwoofer frequency: 30Hz-120Hz Upgrade: 1. Karaoke function with microphone 2. External sound input sensitivity adjustment Material: Metal colour: Black Package Contents: 3 x 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.