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people lisen music while riding a bike.
But often used as an outdoor speaker because of the danger when wearing the earphones. Bottle speaker propo ses enhanced usability and portability of outdoor speakers.
Hoseo university
Asan-si, South Korea
BoSoon Kang,
Hoseo university
SeoJI Sun,
Hoseo university
Geonhyeong Kim,
Hoseo university
JuHee Jo,
Hoseo university
