网页Inspiron 15/15R Owner’s Manual Computer model: Inspiron 3521/5521/5537/3537 Regulatory model: P28F Regulatory type: P28F001/P28F003 OM_Book.book Page 1 Monday, June 10, 2013 3:30 PM. Notes, Cautions, and Warnings ... Trademarks used in this text: Dell™, the DELL logo, and Inspiron ...