Asus AC Adapter 90W 19V, MPN 04G266006220, is a replacement power adapter for compatible Asus notebooks. Its 90 W rating and 19 V output identify the power requirements it serves, while the three-pin 5.5PHI connector describes the connection needed by the notebook.
The listed compatible models include A8JC, A8SR, F3JA, F3KA, F3T, F7KR, F8SV, F9DC, M50SA, M50VN, M51KR, M51SE and M51SN. These references span the A8, F3, F7, F8, F9 and M50/M51 families, so check the exact model and connector before choosing this adapter.
It is intended to power a listed compatible notebook when paired with the required power cord. The power cord is not included, so this item is the adapter itself rather than a complete cord-and-adapter set.