This 9 Pack Consists of: Telephone Cord CouplerIn line phone cord coupler connects 2 phone cords together for extended length. The 4 wire telephone jacks work with all 2 or 4 wire systems. Good for phone or fax modem lines. Allows use of standard phone connector.Telephone Splitter JackSplits 1 phone cord into 2, for use with 2 phone devices, 4 wire telephone jacks. Works with 2 or 4 wire systems.Ivory Telephone Splitter AdapterThis ivory colored 3-in-1 phone jack adapter converts single phone jack into 3 jacks for connecting up to 3 phone devices. Allows use of standard phone connector, 4 wire system works with all 2 or 4 wire systems.Phone Splitter Adapter6-conductor multi line adapter can turn 1 line into many. Separates 3 line phone jacks, use with separate phone, fax, or modems. Allows up to 3 telephone numbers on 3 separate lines.