It's an unusual cable in that it's bidirectional, but it's not full duplex. So there's no mic input, but you can use it for both audio input and output (e.g., p

It's an unusual cable in that it's bidirectional, but it's not full duplex. So there's no mic input, but you can use it for both audio input and output (e.g., plane audio jack to headphones OR iPhone to vintage car head unit). I strongly suspect a lightning-to-lightning connection (e.g., headphones to iPhone) would be full duplex though.