USB Features: Support MP3. Built in 445W power amplifier. Power supply: DC 12V. Radio Frequency :US AND EUR. Meets ASTM B117 salt/fog standard. Installation Dimensions: 130mm x 80mm. Waterproof Speakers(White& Black). Mounting Hole Diameter: 97mm(3.818). Mounting Depth: 35mm/(1.37). Grill material: UV Plastic. Magnet Material: Ferrite, 4oz. Magnet Protection: Plastic Water Guard. Application: Boat, yacht, SPA, swimming pool, ATV, UTV. The 4 inch Marine Speaker has a fully waterproof design, UV and salt/fog protection. Marine Waterproof Box Speakers(White& Black). Self-contained pod speakers with mounting brackets. Contains 100mm air-suspension woofer with 25mm tweeter. Frequency response 80-20,000Hz. Dimensions 115mm (W) x 110mm (H) x100mm (D). Supplied as a pair of two speakers. Idea for: Boat, ATV, UTV, RV, RZR, Golf cart, Jeep, Truck, Tractor. Marine Radio Antenna (White& Black). The flexible mast helps it withstand bracing winds, while the corrosion-resistant rubber exterior ensures that it won’t succumb to salt and spray. You can mount the antenna in a variety of locations on almost any boat, Heavyduty, Car Yacht. ATV UTV RV Tractor environment. Waterproof Engineering Design For Humid Environment, Indoor/outdoor Available. Waterproof Grade IP66, Meets ASTM 117 salt/fog Standard. The Flexible Mast Helps it Withstand Bracing Winds. Weight: 200g, Cable Length: 52″, Antenna Length: 13.3″. All items will be tested in advance before sending out. Marineaudios_9 , our company is dedicating to reseach & development of marine audio series products. If you are dissatisfied for any reason, please donot be quick to leave negative/neutral feedback. Our working time: Monday to Friday 9:00 18:30 (China time).