Sliders are a little stuck they will need some contact cleaner to free them I moved them up and down with a toothpick they worked perfect!

This item is tested everything works both color lights work , buttons for eq, sub and nob works.

The Kenwood KGC-4042A Graphic Equalizer Subwoofer is a high-quality audio component designed for old school car systems. Made in Japan, this equalizer is from the reputable brand Kenwood, known for producing reliable and durable electronics. This model, KGC-4042A, is specifically crafted to enhance the sound quality of car audio systems, providing users with a truly immersive listening experience. Its graphic equalizer feature allows for precise control over the frequency response, ensuring a smooth and balanced sound output.