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Norelco HB-0938 Smokey smoke detector

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Uploaded by on Dec 29, 2007

A demo and test of the Norelco HB-0938, a brother to the HB-0933 which is featured on howstuffworks_dot_com.

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Science & Technology

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  • The squealer horn is better than the piezo because it's more reliable to wake up a child and chirps at a more tolerable tone when the battery is low.

  • okay thanks. also at my sound wasn't working well. it is now. I see the difference as well now although the square in the centre of the 0933 somewhat does resemble a test button. I seemed that most 1970's alarms had to be tested with smoke.

  • Watch the vid.

    The 0938 has a test button. The 0933 doesn't. You had to use smoke to test it.

  • Whats the difference in the alarms? They both look the same. What year is this alarm from?

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