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you can tap anywhere on the black screen to increase the count by 1.

press the blue reset button to reset the count to 0.

press the volume up to increase the count by 100.

press the volume down to decrease by 10.

press the info button at the bottom left corner to get a instructional manual page.

don't start with the volume up or down, the count will not start with 0.

start by tapping anywhere on the black screen first, then use the volume rocker.