The Adapter is a 85W rated power supply and replaces apple a1172 laptop charger. Designed to meet Apple’s original specifications. The Replacement Apple AC Adapter is designed to be 100% manufacturer compatible and will meet OEM specifications.Keep your adapter in a dry place with room temperature. Just like other electronic devices, adapter can get damage cause by high temperature.Replacement For Apple A1172 Adapter is rated at 18.5V 4.6A 85W.The high quality laptop charger for apple a1172 provides your laptop with safe and reliable power.It is over Charge protection, Voltage protection, Temperature protection, Short circuit protection, enjoys 1-Year Warranty,60-Day Money Back!Brand New Replacement For 85W 18.5V 4.6A Apple A1172 AC Adapter/Power Supply/Charger With Laptop Cord.Keep your adapter in a dry place with room temperature. Just like other electronic devices, adapter can get damage cause by high temperature.Avoid the metal tip of the adapter from getting in contact with other metal objects because it can cause short-circuiting. Your laptop might get damage when a short-circuited charger is used.