Learning Resources Time Tracker 2.0 Classroom Timer. Keep children on track with bright and colourful visual cues. Simply use the auto set function, or easily program the green, yellow and red section along with six sound effects to indicate to learners when time is running out. The 180 viewing area ensures everyone can see the traffic light style timer. With six sounds to choose from, this easy-to-use Time Tracker is great for tests, experiments, practice lessons, and playtime. Requires 4 AA batteries (not included) or can be used with a AC Adapter (not included). Measures 22.5 cm H.