100 Pack RJ9 4P4C 4P2C Plug, Uvital Standard Telephone Handset Modular Plugs Male Connectors Transparent Color Jack Crimp End Crimper

RJ9 modular headset jack is used to connect to handset, or headset via the amplifier to the phone.RJ stands for Registered Jack. You may come across headset advertisements that use one of the following terms RJ9, RJ10, or RJ22. The terms are used interchangeably to talk about a headset that plugs into a desk phones standard handset port (potentially via an amplifier). The headset then essentially replaces the handset.These headset connectors RJ9, RJ10 and RJ22 all refer to the same, this item, four-contact 4P4C handset or headset plug.The handset/headset RJ9/RJ10/RJ22 plug (this item) is smaller and not the same as RJ11/RJ12 telephone jack you will find on your wall line at home.