KONNET Booming Lite Slim Edge Portable Speaker System for iPhone 4, iPhone 3Gs, iPhone 3G, iPhone and iPod (Black) Slim Speaker System for iPhone/iPodFM Radio / Clock / Alarm FunctionSupport current iPhone/iPod Models Charge Up your iPhone/iPod while connecting with AC AdaptorLine out to allow connection with other Audio / Video Equipment Super Slim Design to allow high mobilityAC or Battery Power Power output: 2W*2Speaker channel: 2 channel stereo outputImpedance: 12Frequency: 120Hz-20KHzSignal to noise ratio: 85dB2 (0.5M & 1W)Speaker Drivers: neodymium- magnetic drivers @ 1.25 X 4 Compatible with: iPhone 4, iPhone 3GS, iPhone 3G, iPhone, iPod Touch 2G, iPod Touch, iPod Nano 5G, iPod Nano 4G, iPod Nano 3G, iPod Classic and any device with a standard headphone jack