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
Cable Splitter– AirTurn
7.5ft V-Drum Y-Cable Splitter for Alesis Right / L-Angle Cord 1X TRS to 2X TS | eBay