An 16.8 kHz sine wave is used commercially as a teen deterrent

Evidence

The sound us ed for a mosquito or teen deterrent is a 16.8 kHz sine wave. In this demonstration, four pure tones rising in octa ves to the mosquito average frequency of 16.8 kHz are presented as follows: 2.1 kHz, 4.2 kHz, 8.4 kHz and 16.8 kHz. PLEASE NOTE: many youngst ers will find th e 16.8 kHz tone unpleasant—be cautious with the listening l evel. — David Howard, Jamie Angus, coustics and Psychoacoustics, 3033

Categorization

• CANDY: Perfect elevator fact: a storefront emits a sound only young ears can hear, literally driving teens away — age-dependent hearing loss as a security tool.
• SEED: Article angle: how human auditory senescence has been weaponized commercially — the mosquito device as a reverse-canary-in-coal-mine where the young are the ones disabled.