Wall AC Charger USB Sync Data Cable for iPhone 4, 3GS, and iPod
I ordered this product, but it didn't work at all. Since I only paid a couple of dollars for it, I would not want to incur any more shipping charge by sending the items back to the vendor. I later learned from friends that they ordered the same and had the same experience. But I don't know their vendors, whether they were the same. Even though it's only a couple of dollars, it's not worth risking that. I just bought one from TJMax for about $8, and it worked.