| 摘要 |
A countdown timer for high performance flashlights and similar battery-operated devices that is initialized with a runtime figure equal to the life expectancy of installed linear depletion-curve cells, that is always on and visible, that counts down whenever the flashlight is switched to the ON position, and that displays time remaining until the installed cells/charge are depleted, thus permitting the user to see at a glance the approximate runtime remaining on the installed power supply.
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