General Features: digital media receiver with AM/FM tuner (does not play CDs) built-in amplifier (22 watts RMS/50 peak x 4 channels) built-in Bluetooth for audio streaming and hands-free calling (mic included) detachable face with two-line display USB 1.5A connection charges devices quickly plays MP3, WMA, WAV, AAC, and FLAC files through USB optional remote control Smartphone Features: works with Apple and Android phones control 2 phones at once voice recognition dialing control PANDORA, Spotify, and iHeartRadio from select smartphones Audio Features: high- and low-pass filters K2 technology improves the digital sound for all music sources sound-shaping tools get more out of your digital music library 13-band graphic EQ and 11 presets Expandability: inputs: front USB (1.5A), front auxiliary input outputs: 4-channel preamp outputs (2.5-volt front, rear/sub)