Seeing the swiftlets flying around and not being attracted to your external sound, this can be solved by using hexagonal tweeter.
Hexagonal tweeter has 6-angle to play the sound to attract the swiftlets around.
It is suggested to install nearby entrance hole with 3-4 ft tall pole.
There are 2 types of hexagonal tweeters
1) Normal Coiled Tweeter - made of 2"x5" full copper coiled tweeter
2) Waterproof Coiled Tweeter - made of 2"x5" full copper coiled tweeter
*Tips on tuning the sound: You may refer to our customer service agents.