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Chatter Tracker is an effective way to keep noise to an appropriate lelvel in the classroom, dinning hall or library- wherever you need quit! The unit can be set to your chosen decibel setting. When the noise rises above that level the flashing amber light will come on as a warning. When sound reaches fifteen decibels above the set level, the red light and siren will be activated. Ideal for children with attention disorders or behavioural problems.