Unverified90% confidenceCautionTime unknown
海上/水上活动不要选普通玻璃或金属信号镜，应选可浮于水面的聚碳酸酯漂浮款，否则落水即沉，失去救生意义
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90%
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Long-term
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Unverified聚碳酸酯材质耐摔不易碎且可浮水，适合水上运动、皮划艇、漂流等可能跌落水中的场景，玻璃镜面款不具备浮水能力83% similarUnverified水上救生场景不要选含豌豆球的哨子和纯金属沉重款，应选浮水材质或空腔可漂浮的无球哨，落水后不下沉且进水仍能吹响81% similarUnverified海上信号镜必须选浮水（floating）设计或带系绳孔，落水后能漂浮或系于手腕；不带浮力且无系绳的镜子落海即失，海上环境不建议购买80% similarUnverified主打浮水功能，适合海上皮划艇、帆船等水上活动救生包；若仅用于陆地徒步/登山求生，浮水特性无附加价值，且聚碳酸酯镜面不如玻璃镜面反射强度高80% similarUnverified水域场景选浮水型哨（内部空腔+轻质材料可漂浮），落水后不易沉底，普通实心金属哨落水即沉无法找回80% similar
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