My car usb port cannot charge the phone so I'm looking at the usb adapters that plug into a cigarette lighter. I've seen a bunch of posts mention Griffin so I looked at those. One is even listed on Apple's website, both are carried by Walmart but I'm confused with the info. There is one that comes with an Ipod cable and is listed at 2.1a, this info is on Apple's website. There is another one that is the Griffin micro universal. I can't find if this is also 2.1 or not. I've read reviews that say if it is only 1a, it is very slow and will not charge as well. I have no need for the cables that are included but if it will charge better I'll order this one. Would like to get some opinions as Walmart only carries the micro in store. I'm going to try it but would also consider Scosche if that's a good brand.