This curly modular phone cable consists of a RJ9 (4P4C) male plug on both ends and has cross-over wiring. It is typically used in to connect a handset to a telephone base.
This modular cord detangler has a
RJ9 male on one end and a RJ9 female on the other. It can rotate 360° and
is used on RJ9 handsets to keep the cord from tangling.