visibility design: a lifebuoy light with a intensity flashing LED and an extended body provides visibility in rough seas, making it easier to locate the lifeline quickly in an emergency. Quick and reliable activation: the device activates the battery quickly, and if the battery is damaged, the lifebuoy light instantly starts flashing the automatic strobe LED at 50–70 flashes per minute. Its efficient energy storage supports floating illumination when needed. Practical watertest method: install the lifebuoy light upside down on the lifeline. When the device touches seawater and is in a vertical position, the strobe LED turns on automatically, enabling a convenient and efficient testing process. Broad compatibility and safety: designed to be attached to lifelines on lifebuoys, it helps ensure visibility and safety for crew members at sea and for water sports enthusiasts. Use scenarios and applications: Night fishing at sea, where clear visibility of the lifebuoy is crucial Kayaking or rafting in low light or poor weather conditions General boating safety during lateevening or nighttime activities Performance highlights: floating illumination with a bright strobe, constructed to deliver reliable operation in wet conditions and to enhance overall safety on water.