Simply select your assay requirements and choose your optimal match from the preselected list.
ROX reference dye does not take part in the PCR reaction but allows to normalize for non-PCR related signal variation and provides a baseline in multiplex reactions. Mixes with lowROX contains 50 nM ROX and mixes with highROX contains 500 nM ROX in the final assay.
Mixes with UNG (UDG, Uracil-DNA-Glycosylase) and dUTP instead of dTTP minimize the risk of carry-over contamination with DNA from previous PCR reactions. The UNG treatment at the onset of thermal cycling removes uracil residues from dU-containing DNA and prevents it from serving as template.
Also see: qPCR-mixes: Which one to use?