3.5mm-- iPhone, iPod, iPad, tablets, laptops, MacBook Pro, MacBook Air, Notebook, Computer, MP3 players, and other 3.5mm-enabled devices.
2RCA-- Hi-Fi amplifier, DJ controller, turntable, sound soundbarbar, speaker, home cinema system, car stereo, VCR, DVD player, TV, video camera, AV receiver, projector, Sky HD box, and other 2RCA-enabled devices.