The phone cord wireless detangler stops your coiled phone cord from becoming twisted and tangled. Rotates 360° as you do while you are talking on the phone to extend the life of your phone cord The phone wireless detangler includes high quality gold-plated metal contacts to ensure great connection and great sound quality The phone line wireless detangler fits family or office fixed telephone. Works on RJ11 4P4C models of handset cords and handsets. Not applies to VOIP phone,not fit for RJ45 Modular Plug Easy to use,installs easily without the need for tools. Simply plug the detangler into the end of your handset,and plug the handset cord into the detangler on the other end,and now they are connected. Removal of the detangler is also very easy Fits most handsets but the plug may don't fit into the headphone socket as it is too short,you should give it a little spin,then you won't feel frustrated with entangled cord Uvital Telephone Cord Detangler, Wireless Anti-Tangle Telephone Handset Cable 360 Degree Rotating Landline Swivel Cord Untangler Black