Possesses RNA 5'-triphosphatase and diphosphatase activities, but displays a poor protein-tyrosine phosphatase activity. In addition, has phosphatase activity with ATP, ADP and O-methylfluorescein phosphate (in vitro). Binds to RNA. May participate in nuclear mRNA metabolism. {ECO:0000269|PubMed:10347225, ECO:0000269|PubMed:24447265, ECO:0000269|PubMed:9685386}. This is the function of Ensembl gene identifier ENSG00000144048 (DUSP11, dual specificity phosphatase 11).