Trouble-free operation - Easy to use - Automatic start 2. Automatically turn off the sound output when the buzzer is turned off to prevent unwanted sounds. 3. Automatically turn off all Windows sounds 4. Can broadcast music in the breaks 5. Can set a separate volume for each melody and music 6. Can play the National Anthem, silence and siren 7. Can make announcements at the end of the ring 8. The .mp3, .wav and .mid play files 9. Separate timeline for weekend courses