3. What devices are supported by the F5's inline control?

A: The F5 is MFi certified, so it's in-line control is completely compatible with the Apple iOS devices.
There is a mode switch on the F5's in-line control unit, which is used for switching between the iOS mode (I) or Android mode (A).
The F5 is also compatible with most of the Android devices. It can be used for music play/pause, switching songs, fast forward/rewind or volume up/down. Due to the existence of different standards among the Android devices, the F5 could not be compatible with all of them on the in-line volume control.