3.5 mm stereo to 2.5 mm stereo converter. Compatible with all 3.5 mm stereo cables. Gold-plated to prevent signal degradation.

Input: 3.5 mm TRS stereo (female)
Output: 2.5 mm TRS stereo (male)

Compatibility: Works with select Sennheiser, JBL, Klipsch, Bose and other headphones with 2.5mm input
Note: Bose QC35 is not compatible