Bluetooth 3.0</br>Rechargeable Battery</br>Two 3" woofers?? two 0.75"tweeters and 2 passive radiators</br>15W x 4 biamplification</br>Speakerphone</br></br>Product Description</br></br>Harman Kardon Onyx Studio 2 Bluetooth Wireless Speaker System: Play your favorite music clearly with this wireless speaker system?? which features two 3"woofers?? two 0.75"tweeters and 2 passive radiators that deliver rich?? detailed audio. You can wirelessly connect up to 2 devices to the speaker system using the Bluetooth 3.0 interface.</br><br/>http://www.amazon.com/gp/product/B012DDB08Cllu