ITEM NAME:3.5mm Male Jack to RJ9 4P4C Female Adapter Converter Extension Cable Wire f A6T2 3.5mm Male Jack to RJ9 4P4C Female Adapter Converter Extension Cable Wire f A6T2 Gender: Male-Female Model Number: Adapter Converter Extension Cable Wire Connector A: RCA Connector B: RCA Type: Audio Extension Cord Application: Multimedia Shielding: Non-Shielded Bundle: Bundle 1 Through the product transfer, you can use the RJ9 interface to transfer the home phone microphone to the mobile phone. Used for the transfer for CISCO telephone Interface: 3.5mm TRRS male, RJ9 4P4C telephone interface female Color: Black material: ABS size: Cable length: About 40cm/15.74 inch(including connector length) Package Contents: 1 x 3.5mm Male to RJ9 4P4C Female Adapter Cable Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.