The Pioneer FH-S501BT will fill the 4″ tall dash opening in your car. This striking receiver covers the space with a multi-color display that lets you choose from thousands of colors — you can even set up one color for the display and another for the buttons. For some extra visual excitement, MIXTRAX syncs the audio from many of your sources, adding transitions between songs along with a light show that pulses and changes color with the beat of the music — MIXTRAX is an innovative Pioneer technology that creates a nonstop mix of your music library complete with a range of DJ-inspired effects.
Built-in Bluetooth:

Pioneer Audio receivers feature built-in Bluetooth enabling both hands-free calling and audio streaming with the latest Hands-Free Profile (HFP 1.6) and Wideband Speech capability. This allows you to experience more natural sound quality and details during calls. When streaming music, AVRCP 1.5 lets you browse and select the media stored on your smartphone.
Spotify:

Spotify gives you all the music you'll ever need. Find the songs you love instantly, or let Spotify play you something great. With support for Spotify, just connect your compatible smartphone to a Pioneer Car Stereo Receiver to fill your ride with everything from classic tracks to the latest hits. Premium subscription may apply.
Pioneer ARC App:

The Pioneer ARC (Advanced Remote Control) app allows you to control select functions on your Pioneer receiver. Access functions including presets, fast forward and rewind, and artist and album search. Users can also adjust audio and Bluetooth settings.
Smartphone Control:

Access music on your smartphone directly from the Pioneer receiver. Search for Artist, Albums and Songs using Pioneer's intuitive interface. With Pioneer receivers you can also access and control select music and radio apps on your smartphone.
AOA 2.0 Support for Android™:
AOA 2.0 enables Android owners to play music streaming apps and control basic functionality, Play/Pause and Skip Song, using the buttons of the receiver. The new feature requires the Android device to be running Android 4.1 or newer and be plugged into the receiver via the USB connection on the front of the unit.
Keep The Party Going:

MIXTRAX® is an innovative Pioneer technology that creates a nonstop mix of your music library complete with a range of DJ-inspired effects. Drawing from Pioneer’s rich DJ heritage and our passion for music, MIXTRAX delivers a unique DJ infused listening experience to those in the car. MIXTRAX takes the music from an iPhone or USB device, and plays it back with added transitions and effects, creating a virtual DJ inside the Pioneer receiver. MIXTRAX makes automatic remixing of tracks extra quick and easy. Simply connect your USB compatible device and listen as tracks are joined by various random sound effects in nonstop mix play to keep the groove going in full swing.
MIXTRAX also features club-style illumination that enhances the mood with a dynamic dance club-like lighting effect. As MIXTRAX begins, lights start pulsing to the beat of the music, adding an extra level of entertainment. Choose among multiple patterns of lighting variations from sound pressure level or low-pass synchronization modes.
Android Music Support:

Users of Android devices runing operating system 4.0 or later can connect to the FH-S500BT to listen to music stored on their device without the need for an app. The process is made possible using Media Transfer Protocol (MTP). MTP allows the CD receiver to recognize the Android smartphone as a music storage device. Users can now access music via USB stored on an Android device and operate basic operations like FF, REW, Play, Pause, Random Play, and Repeat. Metadata information such as track, artist, and album name can be displayed.
USB Auto Switch:
The receiver also includes the USB Auto Switch feature so when the phone is connected via USB the listener has the option to choose whether the receiver uses the phone as a source, or just charges the device.
FLAC Codec Support:

Pioneer Car Stereo Receivers upgrade in-car audio with amazing sound reproduction with their ability to play FLAC (Free Lossless Audio Codec) files, which are 50-60% smaller than WAV files yet retain the integrity of the original sound sources. FLAC playback at up to 44.1khz sampling frequency and 16-bit bitrate for files stored on a USB thumb drive.