You can listen to more detail in music with the Philips PRO6305. Thanks to Hi-Res support, the earbuds play losless files. These files are much larger than regular MP3 files, allowing you to hear more detail. If you receive a phone call while listening to music, you can answer it with the button on the cable. You can make a hands-free phone call with the integrated microphone. 3 different earbud sized are included by default.