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Front of the 610 with charger in place
The top-left button activates the backlight, while also turning the device on and off. The upper-right button is used just to start and stop the timer. The bottom-right button marks new laps and resets the timer. I find it odd that you press and hold the bottom right button to reset the device, which acts to save the previous workout.
The touch-sensitive area on the bottom activates the menu options. The left touch-sensitive area is used to go back.