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Remove 4 letters from this seq...

Remove 4 letters from this sequence (STMATIEQMENHT) to reveal a familiar English word.

Correct answers: 43

The first user who solved this task is Nasrin 24 T.

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Answering Machine Message 55

English accent: Hello, you've reached the phone of Monty Python. I can't come to the phone right now because the witch has turned me into a newt! I'll call you back when I get better.

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Ultrasonic alarm

In 1953, the first U.S. patent for a burglar alarm operated by ultrasonic sound was issued to Samuel Bagno of New York City (No. 2,655,645) on a system for movement detection in a confined space by intruders or fire. It was manufactured as the Alertronic and first sold in Jun 1950. A sound source produced waves of 19,000 hertz, a frequency too high for normal human hearing. An intruder could be detected by the alarm by a difference in frequency of the reflected waves from the moving body (the Doppler effect). The device would then sound an alarm.

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