App Ready Marine Commander Stereo - BT/AM/FM/APPFeatures:2.8" color TFT display viewable in direct sunlightGlass lens to protect display from cleaning productsApp Ready - All main functions can be controlled by any Bluetooth-enabled device with Polk Ultramarine appLow-profile flush-mount design and detachable trim ring for front mountingCompatible with PA4ATAB and UM2TAB source unit modulesRotary encoder for volume control and menu-driven user interfaceConformal coated PCBIPX5 waterproof designUV resistant (ASTM D4329)Corrosion resistant (ASTM D1141)Dimensions: 5.4" W x 3.75" H x 1.7" D