KIT 17 red power cable w ring terminal & rubber boot pre-installed, 3 black ground cable, 16 blue remote cable, 40A fuse, 16 RCA, 1 large black rubber terminal boot, 1 ring terminal, 7 wire ties, plastic groumet, 1 tap screw Space Saver - If you are tight on space, this is a great solution for you. The combination of amplifier and subwoofer all into one, makes this ideal for spatially challenged vehicles. With a slim design, there are a few installation options Pulse Width Modulated - PWM simplifies power supplies. It controls the output voltage and current precisely by not only removing the output current sensing loss, but also eliminating all secondary feedback circuitry. Efficiency. Increased reliability Variable Low-Pass Filter - A low-pass filter is an electronic circuit that removes all the notes below the filter's frequency setting.