Powerful stereo sound performance at your fingertips, automatically orient your iPhone to watch video with a touch of a button. Advanced speaker technology shields against mobile phone interference for rich static free sound. Powerful Sound Dynamic Bass Boost electronically enhances the low tones Class 'D' Digital Amplifier for quality sound performance Take your music with you Rotate the iPhone to watch video at the touch of a button Always ready to go AC adapter lets you power up at home. Mobile phone shielding technology means static-free sound Share your music anywhere Wireless remote Power your speakers with batteries when you are on the go. Sound Frequency response: 100-20,000 Hz Impedance: 4 Connectivity Connector: iPod and iPhone dedicated Convenience Power on indication Volume control Power Adapter type: 12 V 2 A.