PrimaCase - Rapid Car Charger (1000 mAh) for Apple iPhone 4, 4S, 3, 3G, 3GS / iPod nano, Touch / iPad 1, 2 & 3 (Electronics)
Easy, reliable, for I had previously purchased a product separating charger and connection cable but less reliable. To view reliability over time, ds that case I hope that the warranty was up. But for now it works. In fact I have an iPhone 4.