This receiver makes your car audio system expandable. The pre-amp outputs allow you to hook up external amps for your speakers without needing to purchase additional accessories. Since this has 3 sets of pre-amps you can hook up multiple amplifiers. This has front, rear, and sub pre-amp outputs so you can amplify all your interior speakers, and add a subwoofer amplifier. This receiver utilizes 5V - preamp outputs. Since this has 5 Volt preamp outputs you will get more power out of your external amplifiers due to the high voltage signal. 2 Channel Rear Audio and Video Output Have a flip down or headrest monitor? Connect them to the 2 channel RCA output so your back seat passengers take advantage of all the receiver has to offer as well. FM/AM Receiver with 30 Preset Memory Enjoy your favorite radio stations on the go, and with 30 presets your favorite will always be at hand Full Function Wireless Remote Control Included Let your passengers enjoy the receiver with the wireless remote, change volume levels, switch tracks and more Built In Steering Wheel Control Interface The RVD7.0 MK2 will integrate with your factory steering wheel volume controls. Normally you would need to buy a $50 accessory to retain those controls. This receiver has this function built in along with an easy to use set-up menu that you program to connect to your steering wheel controls. No accessories required! Full One Year Rockville Warranty Built to last with a Rockville 1 Year warranty, see below Rockville's rigorous quality control standards and what makes Rockville an industry leader! Features: Rockville RSD7 7 Motorized Touchscreen Double DIN DVD/USB/SD Receiver with Bluetooth Factory Steering Wheel Control Compatible (no accessories required; steering wheel control interface is built in) Full Function Remote Control Included