引导声外声-NTSG 3 Leading Sound (External Sound )
引导声外声-NTSG 3 Leading Sound (External Sound )  A202 Leading Sound 引导声 (外声)  Swiftlet Sound System 燕声工程与音响 Johor Bahru (JB), Malaysia, Desa Jaya Supplier, Suppliers, Supply, Supplies | Nest Tech System Sdn Bhd
成功燕屋专用引导声(外声) Successful Leading Sound (External Sound ) -NTSG 3

此燕声需具其特性,需要有强力的引导能力,方能有效把燕屋外部的燕群,引进燕屋内部。
External sound. Effective to attract and lead swiftlets into house.
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