Bells: Bells are the most common sound used to indicate class changes. They are usually rung manually by a staff member or automatically by a timer system.
Buzzers: Buzzers are another common sound used for class changes. They are similar to bells, but they produce a buzzing sound instead of a ringing sound.
Chimes: Chimes are a more melodic sound than bells or buzzers. They are often used in elementary schools to create a more pleasant atmosphere.
Tones: Tones are simple, electronic sounds that can be used for class changes. They are often used in conjunction with other sounds, such as bells or buzzers.
Voice announcements: Some schools use voice announcements to indicate class changes. These announcements can be made by a staff member or by an automated system.
The specific sound or combination of sounds used for class changes can vary from school to school. Some schools may also use different sounds for different grade levels or for different types of class changes.