16 Segment Red
For the techies out there, here's a bright red 40 minutes countdown timer with a bright red 16 segment LCD font on a black background.
Great for helping keep students focused and motivated by working in class.
And if 40:00 isn't the right timer for you, it's easy to change it to whatever you need.
9 Pin Red
16 Segment Blue
Digital Clock - Red
9 Pin Black
Digital Clock - Bright Green
VT323 Digital Timer - Radical Red