Here are some scans from Dewey's notebook. If you would prefer to download this as a PDF file, click here: Room Alarm.pdf. Once you're done with this invention, make sure to print out your own detective badge and join K.I.D.S. Check out the book for more inventions.
Feel free to use this as you alarm sound. Just set the mp3 to loop in iTunes and record it to a cassette tape.
Once completed, don't forgot to print out your detective badge and start solving crimes in your town.