The Planet Audio PEQ10 Car Equalizer is a powerful 4 band pre-amp with a half din design and subwoofer output. This black equalizer is compact, weighing only 1.7 pounds, and comes in frustration-free packaging. It includes a subwoofer output for enhancing your car audio experience. With its included components and batteries required, this Planet Audio product is perfect for car audio enthusiasts looking to adjust and optimize their sound system.