The 25 ft. phone line cord with duplex jack allows two phones or accessories to be plugged into a single modular wall jack up to 25 ft. away. The quality 25 ft. phone line cord has a single modular jack at one end and a duplex jack that accepts two devices allowing them to share a single line. Designed to allow fax machines, modems and phones to share the same line in your office or home this phone accessory can help increase productivity and provide flexibility at your desktop in the devices actively plugged in.