Maybe you lost your charger or suddenly stopped working.Usually, when this happens, we will panic.Usually, it's hard to find a reasonably priced, high quality charger...this charger won't warm up your laptop, It's about the quality of all, the highest performance Mac Book Air replacement charger on the market! Fits Mac model: A1278,A1502,A1344,A1465,A1502,A1425,A1435,A1466,A1398,A1424,ME293, ME294, ME664, ME665, MC975, MC976, MD506, MJLU2, MJLT2, MGXC2, MGXA2compatible with Mac book Air 11 inch: Mac book Air (11-inch Mid 2012) MD223, 224, md102 Mac book Air (11-inch, Mid 2013)MD711,712Mac book Air (11-inch, Early 2014) MD711,712Mac book Air (11-inch, Early 2015) MJVM2,MJVP2compatible with Mac Book Air 13 inch: Mac book Air (13-inch, Mid 2012) MD231,232 Mac book Air (13-inch, Mid 2013) MD760,761Mac book Air (13-inch, Early 2014)MD760,761 Mac book Air (13-inch, Early 2015) MJVE2,MJVG2Mac book Air (13-inch, 2017) MQD32,MQD42,MQD52 helpful tips: -Put it at a dry and cold place when charging. -Do not use the charger with wrong mac model. Any problems, Please feel free to contact us, Your satisfaction is most important to us!