Get three details right—diameter, direction and pole count—and most analog adapter choices become straightforward.
Smaller analog connector used by select radios, headsets and older devices.
The familiar headphone-jack size found on many audio components and computers.
- 01
Measure both ends
Confirm the diameter of the device port and the accessory plug. A difference of one millimeter is enough to make the wrong adapter unusable.
- 02
Read the direction literally
A 3.5mm male to 2.5mm female adapter has a 3.5mm plug that enters the device and a 2.5mm socket that receives your accessory. Reverse the wording and the adapter works in the opposite direction.
- 03
Count the insulating rings
TRS commonly carries stereo audio. TRRS adds a fourth contact that may carry a microphone or remote signal when the wiring standards at both ends match.
- 04
Check case clearance
Protective cases can leave a narrow opening around the port. A slim extender may add the clearance needed without removing the case.