Maybe you lost your charger or suddenly stopped working.Usually when this happens we will panic.Usually its hard to find a reasonably priced high quality charger...this charger wont warm up your laptop Its about the quality of all the highest performance Mac Book Air replacement charger on the market!Fits Mac model:A1278A1502A1344A1465A1502A1425A1435A1466A1398A1424ME293 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 md102Mac book Air (11-inch Mid 2013)MD711712Mac book Air (11-inch Early 2014) MD711712Mac book Air (11-inch Early 2015) MJVM2MJVP2compatible with Mac Book Air 13 inch:Mac book Air (13-inch Mid 2012) MD231232Mac book Air (13-inch Mid 2013) MD760761Mac book Air (13-inch Early 2014)MD760761Mac book Air (13-inch Early 2015) MJVE2MJVG2Mac book Air (13-inch 2017) MQD32MQD42MQD52helpful 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!