Description:Capacity:60WVoltage:16.5V,3.65AConnector Size Internal Diameter:5 PinThe 60 Watt Power Adapter features a magnetic DC connector that ensures your power cablewill disconnect if it experiences undue strain and helps prevent fraying or weakening of the cables over time.In addition, the magnetic DC helps guide the plug into the system for a quick and secure connection.Warmly remindIf it is hot when charging, it is normal,don't worry.When the mac is out of power,at this time,the mac will need power adapter work beyond itscapacity,and then the power adapter will cause large heat.Our power adapter has a "high heat protected "function,that is to say,when the heat is morethan 60 degree,it will protect automatically,so don't worry,friend.But another possibility:You bought a wrong item,which will cause too hot.So when you place an order,pls double confirm your mac model No. and size.If you are unsure,you can see your original one or pls feel free to contact us.Thanks!