Jack stereo maschio 6,35 mm 1/4" TRS a 2 x 6,35 mm cavo splitter TRS femmina 3 m

3.5mm AUX Male Jack to 6.35mm TRS Female Converter Adapter Audio Cable 1M. This 6.35mm Male to Dual Female Y Splitter cable is designed to split (duplicate) one stereo into two. NOTE: This 1/4 splitter adapter cable takes a stereo signal and converts it into two separate stereo outputs, it's can not combine two outputs into one input.

eBay