Take two of them, and place them in a pair of platform-soled boots, with the activation button situated just beneath the wearer's big toe. Presto: Boots of air walking.
Mount an adamantine spearhead on it, and activate it just below the waterline in the path of an oncoming ship.
After climbing a difficult slope, use one to attach a rope to for your less-agile friends. Faster and less noisy than hammering pitons.