3.5mm Cable allows you to connect your device to a car stereo or home theatre system with 3.5mm input. Audio splitter allows 2 headphones to be connected simultaneously. Airplane adapter lets you connect to the airplane entertainment system using your own headphones. 2.5mm Audio jack adapter allows you to convert from a 2.5mm to 3.5mm connection. Jack adapter allows you to connect your device with a 3.5mm Normal 2-Channel earphone.