The FH-S520BT is a built-in CD receiver designed to accommodate the smartphone lifestyle. When using Smart Sync with Amazon Alexa, it opens up new possibilities for this digital media receiver. This application allows you to broaden your access, whether wired or wireless. The receiver has a built-in amplifier and is equipped with two pairs of RCA pre-outs. It has a 13-band customizable graphic equalizer, which increases to 31 bands when using Smart Sync. The crossover network can operate in either Standard Mode or Network Mode. Features include the Smart Sync app with Amazon Alexa, Bluetooth?, USB direct control for iPhone?, and much more. Alexa Built-in When Paired with Smart Sync App iPhone? Compatibility Android? Compatibility Built-in Bluetooth? 2 pairs of Preouts