What is the difference between these two ends (3.5mm to 2.5mm) Is it the length and are they compatible?

The female end of the adapter has a bigger width at 3.5mm where the male end width is smaller at 2.5mm. The adapter is made to allow a bigger 3.5mm plug in with a 2.5mm plug coming out. Hope this helps.

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Maxell 190398 Headphone/ Cell Phone Adapter Kit (HP-21)

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20 feet Cord Length

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Learn more about the maxell 190398

Model
Brand	Maxell
Model	190398

Details
Type	Adapter Kit
Cord Length	20 feet

Features
Features	Dual-pin airline adapter 1/4" Stereo adapter Cell Phone adapter (3.5mm to 2.5mm) Dual headphone adapter iPhone Adapter 20' Headphone extension cord

Additional Information
First Listed on Newegg	July 31, 2016

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