Stock Photo - PRODUCTION - 20 April 2023, Baden-Württemberg, Freiberg A.N.: A Mosquito brand ultrasonic noise transmitter is installed at the Kasteneck School. The acoustic signal emitted by the equipment is in the range between 16 and 18 kilohertz, according to the distributing company. According to the company, only young people and adults up to about 25 years of age can hear this. Noise transmitters are intended to drive away noisy young people. Cities hope to prevent vandalism, and representatives of youth work are sounding the alarm. (to dpa ""How young people are to be scared away with a beep"") Photo: Julian Rettig/dpa. - Freiberg A.N./Baden-Württemberg/Germany

Stock Photo: PRODUCTION - 20 April 2023, Baden-Württemberg, Freiberg A.N.: A Mosquito brand ultrasonic noise transmitter is installed at the Kasteneck School.

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