Grace Digital GDI-BTAR513 100 Watt Digital Integrated Stereo Amplifier with Built-In AptX Bluetooth Wireless Stereo Receiver Stream music via any Bluetooth enabled device such as a smartphone, tablet, PC, or MAC to our high performance integrated amplifier with built-in aptX Bluetooth 4.0 or play music from an additional audio source via the aux-in jack. True 100 watt class D digital amplifier powers any standard bookshelf or floor standing speakers and optional powered sub-woofer. We also include line out if you would like to connect powered speakers. THD &lt; 0.1% at50w. The Compact size is perfect for your bookshelf, den, or computer desktop stereo system. Stream Pandora, SiriusXM, Internet radio or your iTunes music directly from your smartphone or Bluetooth enabled lap top or desktop computer. Front panel: audio source selection, volume, treble, bass, balance, LED indicators and standby button. Rear panel: power, speaker connections, line out, aux in, sub out to powered sub, external high performance Bluetooth antenna What's in the box: GDI-BTAR513 100 watt aptX Bluetooth 4.0 integrated amplifier, credit card style remote control, 25v 4.3A power adapter, high performance Bluetooth antenna, Aux in cable, and manual.