Say what happens at zero
Tell students whether the alarm means stop, submit, switch stations, or prepare for the next instruction.
Visible time for shared spaces
Give students a clear endpoint for transitions, quiet work, quizzes, group activities, and presentation practice.
Keyboard: Space starts or pauses, R resets, F enters fullscreen.
Open the dedicated 15-minute classroom timer
Common lesson blocks
Simple routines
Tell students whether the alarm means stop, submit, switch stations, or prepare for the next instruction.
Choose a sound and test it before the room becomes busy. Use no sound for silent reading or assessment periods.
Fullscreen removes page distractions and makes the remaining time readable from the back of the room.
Choose a duration that includes packing away and movement, not only the core activity.