
This Dynex™ DX-DMP3Y 4.1" 2-way audio splitter lets you connect 2 sets of headphones to a laptop, MP3 player or CD player, so you can share your music with a friend.
A: The audio port is analog so It should be no difference. As long as your iPhone has the standard 3.5mm audio port. you can use this.
Q: Can this item be used for audio input?
A: Should be no problem. Since the audio signal that pass through the splitter is analog, it is not directional, so it is ok for both input and output.