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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 ...
The sound projects out the wide end of the cone. The user can direct the sound by pointing the wide end of the cone in a specific direction. In the 2020s, cheerleading is one of the few fields where a nineteenth century-style cone is still used to project the voice. The device is also called "speaking-trumpet", "bullhorn" or "loud hailer".
Neighborhood Delivery Collection Box Units (NDCBUs) were the predecessor to today’s cluster box units. They had multiple compartments for the centralized delivery of mail to the residents of a building or an entire neighborhood, instead of door-to-door or curbside delivery. These NDCBUs transformed into the “E” series cluster box units (CBU).
Drop box, or post box, a physical box for collection of outgoing mail; Drop box (audio engineering), a device used to connect microphones to a multicore cable; Drop box (stage lighting), a device used to connect multiple lights to one power source; Drop box (weaving device), a device invented by Robert Kay for improved working of weaving looms
There often is a special lock box (also called a "key keeper" or "Knox box") located at the outside entrance, which either gives access to a front door key or directly activates the front door electric strike, to allow the mail delivery person to enter the building. A similar "Arrow lock" is usually located on the centralized mailbox, to allow ...
The makers of the device — called PlantWave — figured out how to translate plants’ biorhythms into music.
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