[. . . ] Before using this device for the first time, please read this guide thoroughly and use the device only in a safe surrounding. [. . . ] Clean up the 90W Universal Notebook Adapter with a soft cloth if solied. Should you even though have a reason for complaints, please send the 90W Universal Notebook Adapter to your dealer. The 90W Universal Notebook Adapter does not belong into the hands of children!Do not connect both car charger and the AC power adapter at the same time. [. . . ] Choose the right output voltage and plug pin according to the charged laptop. [. . . ]