Many types of swiftlet sounds have been proven to be effective in attracting swiftlets to come. Every swallow breeder has a reliable swiftlet calling sound that they concoct themselves to make it seem more unique and effective in calling swiftlets. The sound of the swiftlet calling has a short or long duration with clear and sharp audio quality so it is very effective when used, especially when combined with a device such as a certain brand of swiftlet tweeter that has proven effective.

Of course, we often hear about recordings of in-house swiftlets with short or long durations, which have clear and sharp audio quality, making them very effective in attracting the attention of swiftlets to come and stay overnight. The use of devices such as certain brands of swiftlet tweeters can also increase the effectiveness of the calling voice. Each swiftlet breeder can choose the most suitable format for recording in-house swiftlet voices to use, whether it’s the MP3 format which is smaller in size or the WAV format which allows further editing.