Vocoo Classroom Timer
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I like this timer because it has a lot of great features for the classroom.
The digits are very large and clearly visible from anywhere in the classroom.
The timer turns red when there is 1 minute left.
It has a rechargeable battery (USB-C).
It is magnetic.
It has a custom button (I set mine to 30 seconds).
It can count up or down.
It can count down from 99 hours.