Leading Sound 引导声(外声)
Leading Sound 引导声(外声) 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
引导声(外声) Leading Sound (External Sound )

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.

共有多款成功外声:
Some of the successful external sound :
1. NTSG 2
2. NTSG 3 
3. BNG 1
4. BNG 2
5. BNG 3
6. BNG 4
7. BNG 5
8. BNG 6
9. BNG 7
10. BNG 8
11. BNG 9
12. BNS 12
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