Introduction to the lighthouse's white foghorn: In 1956, the lighthouse was renovated again. Not only was the tower painted with a red and white ring, but a new foghorn was also added. The foghorn on the island is in good condition and is a living specimen of the history of navigation aids in China. It has a range of up to 10 nautical miles. Its working principle is to use an air compressor to store compressed air in several huge steel tanks in advance. When the fog is thick, the valve is activated to release high-pressure gas regularly, and the fog horn is activated to emit low, intermittent and distant sounds. The sound sent a voice of hope to the ship in the fog.