It is ideal as a replacement for a damaged or lost adapter. Charge your notebook effortlessly and use the integrated USB port to power or charge all your mobile devices such as mobile phones, smartphones, MP3 players, etc. A rotating mechanism allows for easy switching between two voltage levels (15 V - 17 V and 18 V - 21 V). The package includes 10 different connectors that fit all major notebook brands and models. The adapter is protected against overload, short circuits, and overheating.