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Want to share music with friends but don't have speakers with you? BS lets you share and enjoy speaker sound much more easily. BS is a pair of portable media player earphones that can become small portable speakers when assembled with PET bottles. There is a cover to the rear of the resonating space. After the cover is opened, a PET bottle cap feature is accessible. The PET bottle cap feature is used to connect BS to a PET bottle, which acts as a large "closed box" enclosure and helps BS increase its volume.