In depth analysis and testing of Mammut Barryvox S avalanche rescue beacon, result is full review.
barryvox
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Avalanche beacon philosophy and new improved beacons by Mammut: Barryvox and Barryvox S.
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Information about Mammut Barryvox avalanche beacon retailed in 2006, historic design was smallest in class and had a nice interface for backcountry skiing safety.