| 摘要 |
A photosensitive device for warning an individual that the interior light level on one side of the window is greater than the light level on the outside of the window includes first and second photo sensors, a comparator circuit and/or a logic circuit and an alarm. The device may also include a timer, an amplifier and rheostat as well as a visual indicator that remains in a on condition after an audible sound is turned off. A reset circuit is used to turn off the visual indicator. A method for accomplishing the same is also described.
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