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A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance. It has been used as a method of crowd control , which has caused permanent hearing damage , having an extremely high decibel capacity (up to 160 dB measured at one ...
Personal safe listening strategies include: [22] [69] [70] Listening to PLSs at safe levels, such as 60% of the volume range. Noise-cancelling headphones and sound-isolating earphones can help one avoid turning the volume up to overcome loud background noise. Sound measurement apps can help one find out how loud sounds are.
The Mosquito or Mosquito alarm is a machine used to deter loitering by emitting sound at high frequency. In some versions, it is intentionally tuned to be heard primarily by younger people. Nicknamed "Mosquito" for the buzzing sound it plays, the device is marketed as a safety and security tool for preventing youths from congregating in ...
For a more peaceful night's rest, we asked professionals about some of the best sound machines that make it easy to fall asleep and stay asleep. The 6 Best Sound Machines for a Restful Night's ...
See 'n Say is an educational toy created by Mattel in 1964 after the success of Chatty Cathy. It was the first Mattel talking toy allowing children to choose the exact phrase as heard. It was the first Mattel talking toy allowing children to choose the exact phrase as heard.
A LectroFan white noise machine A clock radio that includes a white noise machine. A white noise machine is a device that produces a noise that calms the listener [citation needed], which in many cases sounds like a rushing waterfall or wind blowing through trees, and other serene or nature-like sounds.