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Arken

From Openwaterpedia

Arken is an inflatable lifebelt you carry around in swim trunks. The most comfortable inflatable water safety device yet, it provides 75N buoyancy that is enough to keep a 120 kg (265 lb) person afloat. It uses a 16-gram CO2 cartridge filled with compressed air. The lifebelt activates when the wearer pulls the cord on the side of the trunks, and the lifebelt itself inflates in about a second.

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