First: Select the background screen color that you want to use for the color change.

Second: Press the start button and the background will change within 20 seconds!

Third: Press the stop button as soon as you see the background change to the new color!!

Note: You may have to press the stop button a second time to see your test results.
 

You can choose from many colors for the background changes. Try it! Test your response time! Press start


Change background color in:

 

 

 

 

 

 

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