... snap action contact 速动作接点 snap magnet 速动磁铁 snap switch 快动开关，瞬动开关 ...
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magnet snap 磁铁扣
You can snap it to the outside of a jacket, even a heavy one (the magnet is powerful enough to hold tight), or to a hat, for the benefits of a headlamp without the mess of adjustable straps.
WSJ: Everything Is Illuminated, Hands-Free
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