The model 15530 is Hayes lowest-cost 56K modem. It is designed for use in Windows-based systems. The model 15530 is a host-based modem, which uses the Central Processing Unit of the computer in which the modem is installed to perform controller & data pump functions. The Hayes ACCURA V.92 PCI Softmodem is fully compatible with all features of the V.92/V.44 international standards & will also communicate at V.90 & slower speeds. Please note: networking components such as switches, routers, UPS & wireless devices require that speeds & standards be consistent throughout the network to gain optimum performance. To avoid compatibility clashes or for advice, please contact us on solutions@ebuyer.com.