UTV4B Amplified All Terrain Sound System with 4" Marine Speakers & 1" Tweeters - BlackPowersports Plug and Play Bluetooth Audio System with Weather Proof 4 Inch Component Speakers, Built-in Class D Amplifier.Features:Bluetooth Audio Streaming, Stream can Control your Favorite Music APP’s. Easy Pairing with Auto Re-connectMax Power 350 W, High Performance TweetersSpeakers Powered by Internal Class D AmplifierAux-In, Plug and Play for Easy InstallationCompatible with Audio Output of iPod/iPhone Smartphones and MP3 PlayersIncludes (2) Heavy Duty Straps with Velcro, and (2) Heavy Duty Zip Ties for any Mounting PositionWeatherproof, Fully Marinized System, Ideal for ATV/UTVAudio StreamingAudio streaming [A2DP] is an audio protocol of Bluetooth technology. This profile allows for audio to be streamed wirelessly from your compatible device, such as a Smartphone, to the source unit so you can enjoy your favorite music or streaming music service such as Pandora or Spotify, wirelessly. Aux InputThe Aux Input allows you to connect to the audio output of an external device such as an MP3 Player or Smartphone so you can enjoy your music through your system. Built-In AmpSystems with a built-in amplifier do not require the addition of an outside amp to play louder. You only need a 12V power source, a few connections, an audio source such as an MP3 player or Smartphone, and you are ready to start listening. Class D AmpsClass D is a high speed switching amplifier technology that is more efficient, generates less heat and draws less power than traditional Class A/B amps. We use Class D in our monoblock amplifiers to give you massive amounts of power in a relatively small footprint for clean, powerful, bass. IPX RatingIPX is a rating standard indicating a product’s level of protection against water. It ranges from no protection (IPX0) to water splashing against the enclosure (IPX4) to complete immersion in water (IPX8) and close-range, continuous high pressure, high temperature spray downs (IPX9K). The products we test and rate have been designed with activities of the user in mind. Plug & PlayPlug and play systems are the quickest and easiest systems to get up and running. In most cases, installation involves simply plugging the unit into a wired 12V power source. Once you have power, connect your audio source such as a Smartphone or MP3player and you are ready to start listening. WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.