1⃣Multi-functional: The UP-3 Marine host has a bluetooth music playback function when paired with a mobile phone. It can use a USB to play music, photos, and movies. The rearview camera is convenient to observe reversing images, and it has WB/AM/FM radio and preset radio storage. | 2⃣line output: UTVPRO stereo by auxiliary input to play mobile phone music (need additional collocation timeline), also have the RCA output to an external amplifier, can also through the SUBW subwoofer output bond play the bass, you can also use process ZONE function is used to do a separate volume for different areas. | 3⃣UTVPRO ocean radio is IPX5 waterproof and dust-proof with plastic cover, silicone keys, particular waterproof structure and technology. It has a circular hole with a diameter of 3 inches and a minimum installation depth of 3.75 inches. It is recommended to choose speaker impedance of 4OHM 30W and suitable for working temperature: -10-50 degrees, anti-vibration, anti-corrosion, high pressure water gun flushing completely no problem. | 4⃣Scope of application: UP-3 Marine stereo Bluetooth is small in size, easy to install, space-saving, and easy to operate. UTVPRO audio is suitable for mountain off-road vehicles, 7-8M small yachts, golf carts, and Harley motorcycles. | 5⃣After-sales service: As long as you purchase the UP-3 product, the warranty period for the product is one year by online dealers. There are installation guide videos on the platform and related installation videos on YOUTUBE, please make sure to watch before installation to ensure correct installation.