Ctx Power Adapter (AC Adapter Charger for Dell Inspiron 11 (3135) (3137) (3138), 15 (3520) (3521) (3531) (3542), 15R (5520) (5521) (7520), 17R (5721) (5737), 17 7000 Series 7548 7737 Power Supply Cord 19.5V 3.34A 65W )