Inputs & Outputs? The radio Compatable with Bluetooth Wireless Connection Audio Output. USB Port /MP3 Player Radio Presets Allows You to Preset Your Favorite Radio And Listen to it Directly. Diameter of Stereo Receiver? Brings a Neat Surface Mount to Your Boat. Receiver Dimensions– 6.1″(15.5cm) x 4.33″(11cm) x 2.1(5.5cm). Installation Dimensions -5.5″(14cm) x 3.54″(9cm) x 3.14(8cm). Marine Speakers Unit? IP66 Waterproof Performance is The Basic Condition to Become a Waterproof Speaker, that Can be Able to Resistant to strong winds and hypersaline waves at sea. Small 4″ Size for Easy Installation where limited space available; Product Dimensions 4.5″(11.5cm) x 4.3″(11cm) x4.3″(11cm). Marine Antenna Excellent Perfomance? Range of up to 10 Miles for All Marine Band Car Home Radio Frequencies Corrosion Resistant for the Marine Environment. Black Marine Antenna-Included 16.9 Inch Mast and 55 Inch Cable. 2-Way 4″ Marine Grade HIFI Full Range Stereo Pod Speakers, built in 1″ PEI Dome Tweeter. The speakers is compact in size, enjoy the stereo sound performance! The Advantage of Flexible mast has180-degrees Swivel base for maximum mobility. Also has good corrosion resistance in the same time, Corrosion resistant for the marine environment. Dimensions is included 16.9 inch mast, 55 inch cable. Small size for easy installation:The 4 marine surface mounted box speakers comes with Brackets and bolts allows you easily install them into a place where limited space available only. Product Dimensions 4.4″(112mm) (W) x 4.4″(112mm) (H) x4(102mm) (D). 4 channels x 45 watts Built-in Power Audio Amplifier: Use the best audio amplifier to rock the music on the move! It is compatible for many ATVs, UTVs XP900, Powersports Vehicles, Boats, Heavyduty Car Vehicles, even in SPA rooms. The radio Compatible with Bluetooth Wireless Connection Audio Output. Directly listen the music wirelessly on your player Device. Waterproof Performance is The Basic Condition to Become a Waterproof Speaker, that Can be Able to Resistant to strong winds and hypersaline waves at sea. USB input available for Connecting MP3 players or flash drive. Radio presets allows you to preset your favorite radio and listen to it directly next time. 3.8 out of 5 stars. 4.3 out of 5 stars. 3.5 out of 5 stars. 4.4 out of 5 stars. W x D x H: 3″ x 1 5/8″. Cutout Diameter: 3.15″/80MM Mounting Depth:3.5″/90MM. Outside facial Diameter: 4.88″, Mounting Hole Diameter: 4.52″, Mounting Depth:1.37. 7.09″x5.31×2.48″. 4.4″(112mm) (W) x 4.4″(112mm) (H) x4(102mm).