Eathtek Replacement AC DC Power Jack Plug Socket Cable Harness for Dell Inspiron 17-3721 17R-5721 15R-5521 15R-3521 series, Compatible with part# 01K31Y 1K31Y DC30100M800 Compatible Model Numbers: Dell Inspiron 17-3721 17R-5721 15R-5521 15R-3521 Compatible Part Number: 01K31Y 1K31Y DC30100M800 Replacement and high quality,Replace your faulty, cracked or broken dc power Each dc power is tested before shipping All pictures are taken from the real item, please check carefully before bidding.