The sound it produces is similar to the response frequency of swiftlet thus luring more Swiftlets to stay.
Size: 2.5 x 5.5 inches ( 65 x 145 mm).
The copper coil and material inside were made according to my specification. I had requested the manufacture to produce according to what I want. I assure you it is 100% made by Swiftlet farmer for Swiftlet farms.
IF YOU WANT YOUR SWIFTLET FARMS TO HAVE MORE NESTS AND BIRDS USE HI-NESTS QUALITY TWEETER.
GOOD SWIFTLET FARMING ALL!