Puget Systems supplies AC adapters with each laptop. This is an additional adapter. Many people like to keep one adapter plugged in at their desk, or at their office, while keeping another adapter mobile in their laptop case for when traveling.
Model: Clevo ACA-W880CU
For Puget models M540i, M550i, M560i, M560u, M565i
For Clevo models P158SM-S, W880CU, P157SM, P150SM-A