Product Description Music Power Magic is a great Emergency battery, a great FM transmitter and a great Hands free car kit for iphone4G, iphone3G/ 3GS, iphone2G, ipod touch, ipod nano and other electronic products. Product Feature Music Power Magic' s wireless FM transmitter lets you listen to your Iphone or Ipod on your car' s FM radio. It also can charge your IPOD, IPHONE and other electronic products when you keep your favorite music playing for the trip. It is simple to use, just plug the 30 pin connector with iphone or ipod. For other mobile phones and music players, I have to mention the FM functions is an additional usage. Plug the earphone jack of Music Power Magic into your mobile phone or music player' s 3.5mm earphone port and start to enjoy music by your car radio system. Music Power magic gives you the easiest one-button setup. Press the Fn button for about 3 seconds to switch to FM mode and you can press + and – button to choose a channel that broadcast music of your mobile phone. Product Specification/ Models Battery Input: 5pin Mini USB 5V-0.5A Output: 30pin standard iphone interface and USB interface 5V-1.0A Capacity: 1300mAh Li-Pol A grade battery Standby: 200 hours Demission: TBD FM Transmitter 3.5mm audio input earphone interface and work with most of music player has 3.5mm earphone jack Frequency: 76~ 108MHz , adjust frequency by press button + and - by 0.1MHz Hands free speaker Frequency response: 20Hz-20KHz Working range: 3-9 meters Sensitivity: e50dB Working electric current: 50mA Standby electric current: 90¼ A Power: built-in battery Audio input: 3.5mm stereo earphone jacket Working electric current: 50mA Microphone sensitivity: -42 ± 3dB