The Planet Audio PEQ10 Car Equalizer is a 4-band pre-amp with a half din subwoofer output, designed for car audio systems. With a sleek black color and compact dimensions of 8.98x7.68x1.85 inches, this equalizer is easy to install and provides a powerful signal processing solution for optimizing your vehicle's sound system. The included components like batteries and lithium metal cells ensure that you have everything you need to get started on enhancing your car audio experience. Perfect for audiophiles looking to fine-tune their vehicle's sound system, the Planet Audio PEQ10 is a reliable choice from a trusted brand.