The $10 magnetic converter makes your old charger work with your new computer. It’s fatter than you’d think, if you’re dumb like me and didn’t realize it has to encircle the fat old MagSafe. The Best part is not having to spend $80 on a whole new adapter. It’s on there pretty tight. Fits inside of glass Coke bottle but very hard to get out. The worst part is you’re going to lose it. The product is a total courtesy from Apple, who could have just told you to buy a new charger.”]
Source: https://gizmodo.com/apple-magsafe-to-magsafe-2-converter-review-couldnt-we-5928370