Note: The list of compatible models below are a guide only. Please ensure the AC Adapter meets ALL the specifications of your original AC Adapter ie Wattage, Voltage, Amperage and tip size. If you have any doubt contact your Notebook manufacturer
For Lenovo Chromebook N21

IBM / Lenovo Compatible 20V, 2.25A, 45W, 4.0/1.7 Tip Laptop Charger