MR508UABW Single-DIN CD/USB/SD/MP3/WMA/AM/FM Receiver w/Bluetooth. Features: Weather Proof 50 Watts x 4 Max Power, Balance/Fader/Bass/Treble and Preset built-in EQ, Plays Bluetooth/CD/USB/SD, MP3, WMA, FM/AM, Digital Media from Smart Phones, Compatible with Audio out from Smartphones and MP3 Players, USB, SD, Aux, Input, Front & Rear Pre Amp Outputs, Wireless Remote, Bluetooth Hands Free, Make and receive calls, Bluetooth Audio Streaming. Play and control music and apps like Spotify/Pandora wirelessly.Audio Streaming. Audio 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 Input. The 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. Bluetooth. Allows our Bluetooth equipped source units to make wireless hands-free calls when paired with a Bluetooth equipped Smartphone. Communicate via the built in microphone on most of our units [or external microphone if provided] and listen thru your car’s speakers. Built-in Preset EQ. The built-in, Preset EQ allows you to chose from preset EQ curves for a variety of music styles such as Rock or POP. ESP. ESP [Electronic skip protection] is a feature that buffers the CD while playing, storing 5 seconds of music. If disc reading is interrupted, the player momentarily uses the stored data, while the tracking circuitry finds the passage prior to the interruption on the CD for continuous performance. Fully Marinized. Fully Marinized is the term we use for our Marine and Outdoor products that are Weather Proof. We integrate high-tech, state-of-the-art waterproofing materials plus special UV coatings for plastic surfaces, coated circuit boards and connections to protect the product against the harsh outdoor elements and resist corrosion. ID3 TAG. ID3 Tag allows the audio file to store and display additional data such as title, artist, album, track number and more. Pre-Amp Output. This units Pre-Amp outputs let you expand your system by adding up to 2 amps and/or signal processors. SD Memory Card Port. The SD Memory Card port will support a full size SD memory card to 32 GB and can be used for music playback as well as photo and video viewing (on source units equipped with a monitor). Most units support full size SD cards but there are a few that only accept micro SD cards. USB Playback. The USB port will support a USB flash drive up to 32 GB and can be used for music playback as well as photo and video viewing (on source units equipped with a monitor). Some units have a mini USB input but come with the adapter to convert to be able to play full size USB drives. Wireless Remote Control. A wireless remote control gives you commanding access to the key functions of your unit from the palm of your hand.