Was skeptical that I would actually receive a $3 car charger for my iPhone4 that works, but it does! Plugged it in and it started charging immediately. The cord is long enough that it can be used while charging, but not so long that it gets in the way (if you are using any type of windshield/dash mount the cord may not be long enough depending on where your outlet is located). I rarely ever use a car charger as my iPhone sits in a charging cradle all day at work, so if it only lasts for a few charges, it's well worth $3.