Stream music via any Bluetooth enabled device such as a smartphone, tablet, PC, or MAC to our high performance integrated amplifier with built-in Bluetooth 4.0 or play music from an additional audio source via the aux-in jack. * 12W per channel x 2, into 6 ohms (10W per channel x 2 at 8 ohms) class D digital amplifier powers any standard bookshelf speakers. We also include line out if you would like to connect powered speakers. THD < 0.05% at 12w * The Compact size is perfect for your bookshelf, den, or computer desktop stereo system. Stream Pandora, Sirius, 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, external high performance Bluetooth antenna, 2 amp USB to charge smartphones or tablets * What"s in the box: GDI-BTAR122 24 watt Bluetooth 4.0 integrated amplifier, credit card style remote control, 12v 2A power adapter, Aux in cable and manual.