Grace Digital GDI-BTAR512N 100W Integrated Stereo Amplifier with Bluetooth Wireless Receiver (Black) 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. 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. Enhanced noise filtering to minimize noise imparted by any Bluetooth device! Front panel: audio source selection, volume, treble, bass, balance, LED indicators and standby button. Rear panel: power, speaker connections, line out, aux in, external high performance Bluetooth antenna, 2 amp USB to charge smartphones or tablets What's in the box: GDI-BTAR512N 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, 20' of speaker wire and manual