External Sound

My mobile phone rang at about 10.45pm yesterday night. When I answered, I heard an excited voice over the phone - “Is the external sound you sent me a duress sound”. It was my friend – Victor. I said no and why. He said the sound was very good and attracted a lot of swiftlets to his bird house. Some swiftlets even cling on to the hexagon tweeter.

Victor’s bird house has been in operation for almost 3 months already. He has been testing external sound for his bird house over the Chinese New Year holiday. He wanted to have 2 external sounds, one sound for his hexagon tweeter to turn on only in the evening and one sound for the external tweeters to turn from 7am to 8pm.

The external sound that I sent him was bought from a doctor and I have not tried it yet. One of my friends has tested the sound using a test kit in an open field but the result was no good. That is the reason why I have not tried it out in my own bird house.

I am excited now. I will try it in my own bird house today. Hope to see good result.