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Few earbuds or headphones are, mostly because of that whole water thing. The H2O Audio Tri Pro headphones, however, can indeed work underwater, and they can also work independently of your phone ...
For whichever sweaty, water-logged places you find yourself, here are the 9 best waterproof earbuds and headphones—with MP3 storage, Bluetooth, or both.
Typically, waterproof mp3 players have only one exit, intended both for the headphones cord and to be connected to a computer for loading audio. They are built to be minimal in weight and size, and are rarely capable of playing or displaying anything but audio information.
Headphones appeared in the emerging field of wireless telegraphy, which was the beginning stage of radio broadcasting. Some early wireless telegraph developers chose to use the telephone receiver's speaker as the detector for the electrical signal of the wireless receiving circuit. [17]
A metal detector is an instrument that detects the nearby presence of metal. Metal detectors are useful for finding metal objects on the surface, underground, and under water. A metal detector consists of a control box, an adjustable shaft [dubious – discuss], and a variable-shaped pickup coil. When the coil nears metal, the control box ...
Many such devices contain non-functional circuitry or naively constructed approximations of radio transmitters. A few do have functional circuitry, putting out a weak signal with a function generator or a simple timer circuit, but are still largely useless in comparison with a coil-based metal detector; others have been found to contain intentionally obfuscated or completely superfluous ...