Amazon.com: KabelDirekt – 3.5mm Y Adapter & Jack & AUX Splitter (1×3.5mm Male to 2×3.5mm Female, Connect Two Sets of Headphones to a Smartphone/Tablet/Notebook, Stereo, 4in, Black) : Electronics
StarTech.com 4 Position to 2x 3 Position 3.5mm Audio Splitter Cable - MUYHSFMM - Audio & Video Cables - CDW.com
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StarTech.com White Slim Mini Jack Headphone Splitter Cable Adapter - 3.5mm Male to 2x 3.5mm Female - Split the audio from your iPod / MP3 player to two sets of headphones -