The YPM-523 from Hosa Technology is a Y-style splitter cable that splits a stereo signal to two mono signals. It is ideal for simple monitoring systems, letting two musicians listen to the same audio source. The splitter has a right-angle 1/4″ TRS male connector at one end and a pair of 3.5mm TRS female connectors at the other. The 3.5mm TRS female connectors allow users to connect their stereo headphones and hear mono sound from both of the headphones’ speakers.