This product is subject has a big problem when loading shuffle during this load, begins to light green to orange and green again and so dessuite, which is that when using the mac there has dimming the screen rather constant (every 5 to 10seconde) and those, until the end of the total load of the MacBook (I say that for once the load is longer).
A manufacturing defect? probably, I contacted the seller by requesting a refund of the product, this one answered me, telling me he would send me the same product in nine, if he did, and upon receipt of the new charger I installs in charge and he does exactly the same thing as the first.
I tested the two chargers in two different mac and it happens exactly the same thing, so it is an issue of the magazine.
The seller still offered the second feeder, so I did not seek a rebate because in the end the mac handles all the same, but it is unusable during charging (except for those who wish to go out with a headache and eyes compote).
I put one more star only for the seller who offered me the second feeder, otherwise the article itself does not deserve it.
I recommend.
