Television with a caution alarm
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It is normally seen in many households (at least in my household) that older people (sometimes we youngsters) tend to go asleep while watching television. So we can have a television set which gives a message, every 1 hour or 40 minutes, indicating that the television set is ON. Mind you! This message has to be a voice message, which can be easily installed in a television set.
Example of a voice message: "Your television set is on!" if possible indicating the time.