content: Out of the difficult to open package, this adapter worked for a couple of days.I missed the light on the end of the standard Apple adapter (yellow for charging, green for charged).But the price was right, until, it started cycling on and off. The Mac screen would dim and brighten dim and brighten. Boy, was I glad to notice that the on screen battery light was cycling between a/c and battery. Unplugged the Macally, computer ran fine on just battery. Runs fine on the Apple charger I had left at home.The good news is the return to Amazon was extremely easy, presuming the lack of destroyed packaging doesn't void my refund.I've ordered a different brand (with light!). This one may have just been a bad example. I've had good luck with other Macally gear.