Metal 2. 5mm Mono Plug (male) to 3. 5mm Mono Jack (female) Adaptor - Gold Plated Will fit smartphone headsets however it will not support the speaker or mic functions on the headset.
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Technical Details

Product Details

Product Dimensions

Package Dimensions
Width : 2.68 inch
Height : 0.47 inch
Length : 2.68 inch

Item Weight: 0.32 ounce (View shipping rates and policies)
Shipping Weight: 0.64 ounce (View shipping rates and policies)

ASIN : B005E2Y0ZA