Conformal Coated PCB Illuminated ControlsIPX6-Rated (Water-Resistant / Dustproof)Zero Current Draw Memory (Radio Preset Memory in case of Battery Disconnect)Cutout Diameter: 3"50 Watts x 4 ChannelResin Treated Cloth SurroundPolypropylene ConeDual Cone DesignComposite BasketUSB PortUSB Charging (2A)Front Pre-Amp OutputsAux-InCompatible with Audio Output of iPod®/iPhone®, Smartphones and MP3 players