Owner's Manual
Page 186
... interference that may cause undesired operation. If this equipment does cause harmful interference with the FCC regulations: Product name: Model number: Company name: Dell™ Vostro™ 400 DCMF Dell Inc. or an experienced radio/television technician for additional suggestions. These limits are designed to provide reasonable protection against harmful interference in a particular installation...
... interference that may cause undesired operation. If this equipment does cause harmful interference with the FCC regulations: Product name: Model number: Company name: Dell™ Vostro™ 400 DCMF Dell Inc. or an experienced radio/television technician for additional suggestions. These limits are designed to provide reasonable protection against harmful interference in a particular installation...