No Return / No Exchange Policy.Please check model Number and match with your Product.Generic and Proper DC JackSuper QualityEvery product cross check Before Shipping.Compatible withHP MT42, MT43, MT44HP EliteBook 820-G3, 840-G3, 850-G3, 820-G4, 725-G4, 745-G4, 755-G4828-G3, 830-G3, 836-G3, 840-G3, 8..