My Cable Mart MyCableMart 3.5mm Male to Female Port Extender Shielded OMTP/CTIA, 4 Conductor TRRS

This product is a SPECIALIZED CTIA to OMTP (or vice versa) 4 conductor adapter. Most devices need a STRAIGHT THROUGH extension adapter. Use this adapter if you have a device that uses the CTIA wiring standard and need to convert to the OMTP wiring standard (or vice versa) 3.5mm 4 Conductor MALE to 3.5mm 4 Conductor FEMALE Extender/AdapterShieldedGold Plated conductorsOuter Diameter: 6.79mm (Slim Design)Ideal for use with Smart Phone use with Credit Card swipers, or cables that have a thicker housing.Tested with PAYPAL and INTUIT card readers that need a 4 conductor connectionPIN Assignment (Male:Female) 1:1, 2:2, 3:4, 4:3See PRODUCT MANUAL for pin assignment drawing