Used between the telephone and the handset to prevent the telephone line from tangling, mainly used for home or office landline phones The Telephone Cord Detangler , provides here, Fit RJ9 plug 4P4C, cable length:30mm/1.18; Telephone Handset Cord Length: 2meter / 6.56ft 360-degree rotation, easy to install, effectively extend the phone line, prevent the phone line on the desktop from tangling, and effectively prolong the service life of the phone Steps of intallation:1. Link the Telephone Cord Detangler with one end of the Telephone Handset Cord. 2. Plug the other end of the Phone Handset Cord into the phone holder. 3. Plug the other end of the Telephone Handset Cord into the phone Before purchasing, please confirm whether the plug type of the telephone handset is correct