iPhone power station is a portable power station for iPhone 4, as well as iPod, iPhone 3G&3GS etc, which is with apple dock connector. iPhone power station with built-in 850mAh Lithium-ion Polymer battery keeps your iPhone playing even when its internal battery runs out. iPhone power station is a great solution for short trips, hikes, or anytime you don't have any access to an AC plug. There is no doubt that iPhone power station can bring you much convenience.