The 12" Time Timer® is the heart of any classroom or boardroom. Students learn more when teachers are able to spend more time teaching instead of refereeing. Meetings stay on track when everyone in the room knows how much time is left. At the front of the room or hanging on a wall, the disappearing red disk on our largest timer is used by teachers and business professionals around the world. Manage activities and reduce stress of transitions. Ease testing anxiety as students are able to see at a glance how much time is left. Sharpen concentration when students try to finish "before the red is gone". Avoid confrontations over shared resources. Keep meetings on schedule. Manage speakers, presentations and breaks at large events. Coordinate practice time and game breaks. Patented red disk that disappears as time elapses. No ticking, no distractions, no setup required. Optional audible signal when time is up. One AA battery is required for operation (not included). Bundle of 2 Timers.