Unverified88% confidenceCautionTime unknown
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
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88%
Confidence
Long-term
Relevance
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Unverified海上/水上活动优先选浮力型或带浮力挂绳的树脂信号镜，玻璃镜落水即沉且破碎后失去反射功能84% similarUnverified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80% similarUnverified海边/泳池使用不建议买不带漂浮设计的重型音箱，落水即沉；应选标注可漂浮（float）的机型76% 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75% similarUnverified水上活动（漂流、皮划艇、船钓）不要选带内球的普通哨，落水浸泡后无法发声；应选专为水上设计的无球哨并确认可漂浮或系挂救生衣74% similar
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