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Waterproof audio player
Waterproof audio players are devices capable of storing and playing audio media while being in contact with water. One intended use of waterproof audio players is to listen to audio where regular portable audio players cannot be used so as not to risk getting them wet. As advances in technology makes them smaller and lighter, they are becoming more and more popular in swimming pools.〔http://books.google.com/books?id=ZJDc_M23od0C&pg=PA15&dq=MP3+players+and+swimming+pools〕
==History==
While waterproof Cassette players and CD players were developed and manufactured, their size, coupled with the fact that both had to include an opening mechanism, prevented customers from using them while swimming. Generally, they were intended for use in a shower or by a pool. They were rarely to be actually submerged in water.
With the advent of mp3 players, things began to change. The players became smaller and did not have to be opened, therefore making it much easier to waterproof them. The first (waterproof mp3 player ) was produced by Oregon Scientific〔http://books.google.com/books?id=QccDAAAAMBAJ&pg=PA166&dq=waterproof+audio+players#PPA167,M1〕 and several others followed.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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