This special equipment is said to be able to lure more birds to your BH roof top.
The best is to use the gadget to pull those birds flying above your neighbor's BH.
It can easily pull those birds about 500 meters to 800 meters.
It is made up of steel plate and when used the sound seem to give a bit of the resonance or echo.
The only setback is that it comes with four square tweeters located at the base of the instrument.
You need to open the base plate to check if any of the four are working properly.
If they are not you just replace the faulty one by unscrewing those two screws.
The product is sold at RM 400 inclusive of freight.
