Warranty - BOSS Audio Systems provides a powerful 3-year platinum online dealer warranty so long as the purchase is made through . We strongly encourage professional installation of this product to ensure proper and safe functionality. Power - You can get 50 watts x 4 Max power from the 609UAB to power your speakers. An amplifier is recommended to make sure your speakers are well powered. Outputs - Use the front & rear pre-amp outputs to hook up your speakers (front left/front right and rear left/rear right). Inputs - The USB port gives you the option to have a vast library of audio files at your fingertips. The auxiliary input is a convenient way to hook up to your MP3 player/device. Auxiliary - Compatible with the audio output from smartphones as well as MP3 players. Media Playback - Play music through your Bluetooth device or use the USB port. Digital media support includes MP3 and WMA file formats. Tune into the AM/FM radio stations for up to date music/news/sports and more. Bluetooth - Answer/make calls and be hands-free with no distractions. The built-in microphone picks up your voice and your car speakers let you hear the person on the other side. Play and control your music and apps like Spotify/Pandora wirelessly.