Headset Adapter 3.5mm 4-Pin Female TRRS to 3-Pin Male TRS Plug

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  • Buy 10 for $12.95 each and save 14%
Headset Adapter Converts 4-Pin to 3-Pin 3.5mm Plug

Quick Overview

Part No.: UNC-LRG

3.5mm 4-conductor to 3-conductor Adapter - Price $14.95 each

Adapts your 4-conductor 3.5mm male plug so it can receive the audio properly when plugged into a 3-conductor stereo jack

Customers buying this item may also be interested in the CRD-LRG adapter, available HERE, which has a short flexible cord between the plug and jack.


Part No.: UNC-LRG

3.5mm 4-Pin Plug Adapter Converts to 3-Pin Male TRS Plug

  • iPhone Headset Adapter Enables 4-pin Male TRRS 3.5mm plug to be used with 3-pin TRS Jack Audio Equipment
  • Adapter accepts a 3.5mm 4-conductor male TRRS Plug so it can be plugged into a 3.5mm TRS 3-conductor female jack
  • Bose Quiet Comfort 4-conductor 3.5mm male plug headset can be adapted to 3.5mm TRS jack stereo airplane seat jacks so you correctly hear both channels of audio.

This 3.5mm Adapter accepts headsets with a 4-pin male plug and the 3-pin plug of the adapter will go into standard stereo equipment so that the headset can hear the audio from an iPod, MP3 player, laptop, tablet, radio, mixer, iPad, and many other kinds of stereo audio devices that typically accept a 3.5mm 3-conductor plug. Many Android devices will not accept an iPhone headset because they are not configured to accept the TRRS configuration, so this adapter will often resolve that issue.

Symptom that occurs when using your headset earphone with stereo audio devices:

SYMPTOM 1: You are trying to use your headset with a stereo audio device (such as an MP3 player). You find that inserting the plug all the way into the jack prevents the sound from coming through loud and clear. You pull the plug out of the jack slightly and then the audio comes through loud and clear. Once you push the plug in all the way, the sound cuts out again, but pulling the plug out slightly seems to make the audio come through perfectly.

SYMPTOM 2: You plug your headset into an audio jack and find that you only get proper sound when pressing the push-button switch. (Download a drawing that explains "Why You Must Press on the Headset Button for Audio")

There is nothing wrong with your headset earphone and the problem is actually a mis-match between your 4-conductor headset earphone and the jack in your MP3 player. Most stereo audio devices are designed to accept a 3-pin male plug with a 3.5mm (1/8-inch) size plug. So when try to plug in a 4-conductor headset earphone into your 3-conductor jack, it fails to mate properly with the internal audio connections for the left and right audio channels. Our adapter will conver the 4-conductor plug to plug into the 3-conductor jacks.

Audio Adapter accepts 4-conductor (3-ring) 3.5mm plug, and has a 3-conductor (2-ring) plug to go into your standard stereo audio devices. This will enable you to use iPhone compatible headsets with iPod and other types of MP3 players and most stereo audio devices. The 3 conductors utilized are the left and right audio and common ground connection. The microphone audio becomes disabled.

This adapter converts 3.5mm 4-conductor TRRS to 3-conductor TRS connector so you can use your earphone headset with stereo audio devices.

Here is the configuration of the connection:

4-Conductor Jack - to 3-Conductor Plug
Tip > connects to < Tip
Ring > connects to < Riing
Ring > connects to < Sleeve
Sleeve not connected

NOTE: This adapter is NOT designed for use with home telephone systems or home cordless telephones.

NOTE: Be sure to push your earphone plug in fully so there is no gap between the plug and the adapter. The earphone plug will snap, and the plug will rest flush against the gold surface of the adapter when it is fully engaged. See Picture showing the fully seated plug.

Additional Information

Manufacturer Scan Sound
Color Black
Compatibility Headsets with 4-Cond Male Plug
Packaging Re-Closable Bag

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Headphone Splitter with Separate Volume Controls

TRRS 4-Conductor Extender Cable

TRRS 4-Conductor Extender Cable

Headset Adapter 3.5mm 4-Cond Female Jack to 3-Cond Male Plug (P/N CRD-LRG)

Headset Adapter 3.5mm 4-Cond Female Jack to 3-Cond Male Plug (P/N CRD-LRG)


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  • Adobe Acrobat Document TRRS Plug in a TRS Jack Size: (423.28 KB)
    This illustration shows what happens when you try to use a 4-conductor (TRRS) plug in a 3-conductor (TRS) jack, and why you get sound when pulling the plug out slightly.
  • Adobe Acrobat Document 4-Cond to 3-Conductor Adapter Connection Details Size: (333.3 KB)
    Details of the TRRS-to-TRS connections for our 4-conductor to 3-conductor adapters. Shows American Headset Jack (AHJ) and OTMP wiring conventions.
  • Adobe Acrobat Document Why You Must Press on the Headset Button for Audio Size: (119.67 KB)
    PDF drawing shows the internal wiring connections for TRRS 4-conductor headset plugs and how the TRRS-to-TRS adapter enables you to restore the audio.