Pioneer DEH-S4220BT

CD receiver with AM/FM tuner built-in Bluetooth for hands-free calling and audio streaming
FLAC file playback from USB devices
detachable face with 2-line LCD display
10-level illumination dimmer
Smartphone Features (see Details for info on compatibility): compatible with Pioneer’s Smart Sync App for multimedia functionality voice control
easy access to navigation, music, and messaging apps
extra sound customization options
selectable source lets you charge your phone without activating the USB port as a source
Pandora and Spotify control through iPhone and Android
control and charging of Apple and Android devices using the USB connection
USB Quick Charge (1.5 amps)

Audio Features:
plays CDs, CD-Rs, and CD-RWs, and USB memory devices (see Details for full capabilities)
Advanced Sound Retriever (ASR) for improved sound quality from compressed music files
13-band equalizer with seven preset tone settings (31 bands through Smart Sync app)
3-level loudness
low-pass and high-pass filters
subwoofer level control

Expandability:
inputs: front panel auxiliary and USB inputs
outputs: 4-channel preamp outputs (4-volt front, rear/subwoofer)