看了這篇去他們官網找說明書來看: The Spot is waterproof rated to IPX4. It will continue to function when subjected to water spray at any angle. This does not include salt spray or high-alkalinity f luids. It is normal for water to enter the battery housing—the headlamp will still function under these circumstances, however, battery life will be diminished. See CARE AND CLEANING for instructions on how to dry your headlamp. 這種設計理念真是令人不敢恭維