\rHi Linda:The RS850 are our top of the line rock speakers, but it is a passive design that needs a powered (or amplified) signal from an Amplifier or Reciever to play music. We do have another pair of 8.0" passive rock speakers as well, our model RX805, which also needs a powered signal. Thes speakers are the basis of a Bluetooth Rock speaker kit featuring these same speakers; a model BTR-805 (Bluetooth Rock). It features a Master 8.0" Speaker that needs to plug into an AC outlet. Which delivers power to both an internal Bluetooth Receiver and a two-channel stereo amplifier. One channel connects to the inner 8" coaxial (2-way speaker). There is a speaker wire that runs from the Master Speaker to the matching Satellite Speaker (same as a single RX805 rock speaker) carrying the second stereo channel. So your Bluetooth enabled devices (Smartphone or Tablet) connects wirelessly to the Master Speaker's Bluetooth Receiver. The Master and Satellite Speakers should be placed between 8 to 12 feet apart for the best stereo separation.I hope that is not too confusing, tim@osdaudio.com.TL/5564\r