2.5mm and 3.5mm Adapters

2.5mm and 3.5mm Adapters - Commonly older non-smart phone Cell phone headsets used  2.5mm jacks. Adapters allow them to be used with standard 3.5mm Stereo mini plug connector headphones.
3.5mm is equivalent to 0.13780"or about 9/64 but we call the connector 3.5mm or  1/8".  
2.5mm  is equivalent to 0.098425" or around 3/32".
TRS means "Tip, Ring, Sleeve, which describes the mating contacts. TRRS would therefore mean "Tip, Ring, Ring, Sleeve, which would have 4 contacts - enough for Stereo Audio and microphone when a common ground is used for all signals. TRS has enough contacts for Stereo Audio or mono audio and a microphone if a common ground connection is used.

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ProCable Shortz Audio Y-Splitter for Audio and Mic

$6.95
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ProCable® Shortz 3.5mm Audio Extender 4 inch Cable, 4-Conductor, white or black

$7.95
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3.5mm Audio and Microphone extender for iPhones and Android smartphones, 4 conductor

$7.95
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Calrad Electronics

3.5mm female to female bulkhead feedthru jack. Mounts in 3/8" hole. Overall length 1.43" gold plated.

Calrad Electronics
$2.70
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iLine Mono Output Adapter Cable, 3.5mm Stereo to 1/4" Mono Cable

$19.99
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IK Multimedia

iLine Mono Output Splitter Cable, 3.5mm Stereo Mini plug to Dual Mono 1/4" Jacks

IK Multimedia
$19.99
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Calrad Electronics

3.5mm mono jack to 2.5mm mono plug adapter, shielded, Nickel plated.

Calrad Electronics
$1.55
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Calrad Electronics

3.5mm Stereo female to 3.5mm Mono Adapter

Calrad Electronics
$0.90
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Calrad Electronics

Shielded barrel connector, 3.5mm stereo jack to 3.5mm stereo jack.

Calrad Electronics
$1.35
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