Skyvast 19.5V 3.34A 65W PA-12 AC Adapter Power Charger for Dell Inspiron 15 3520 3521 3531 3542 3537 15R 5520 5521 7520 N5010 N5110 How to choose a right charger: Step 1, See Brand: DELL Step 2, See Output: 19.5V ~ 3.34A ~ Max 65W. (You can find it in your old charger) Step 3, See Connector/Tip Size: 7.4*5.0mm; interior diameter: 5.0mm; external diameter: 7.4mm (Refer to the picture) Replenish inventory once a month, 100% New from Manufacturer. Worry-free 18-month warranty and friendly customer service.