*****; **********Best Quality Guranteed. *****Connect your analog or digital (DSL/ISDN) modem to a telephone wall jack*****Use to connect a modem to a telephone jack*****Double foil shielded to reduce EMI*****Available in lengths up to 100ft*****Foil double-shielding with the braid shield reduce interference while the twisted-pair construction minimizes crosstalk for high speed, error-free data transfer.