Virtually all modern computers are capable of playing mp3s. Software such as Windows Media Player, QuickTime or Real Player will enable you to listen to hypnosis mp3s with ease, and one or more these programs are pre-installed on most computers.

You will also be able to add to your iTunes library or similar.

To listen to your audios from your phone you can add the program to your iTunes library or you can download an mp3 media player from the App or Google store such as VLC