It just takes couple of minute to fix them but before you start you must have all these stuff otherwise it will never work.
1) High power Amplifier with USB/SD card ready. With ready built DC and Cigarette socket plug. ( you can purchase this Amplifier from my blog it is specially made for Bird Test)
2) 4-6 pcs (more if you wish) 0f Piezo tweeters .2x5" so that it could stand like an A shape after tying the tweeters together.
3) Garden plastic coated wire ( you could get it from Hardware shop)
4) Copper speaker wire about 10 ft . So that you can put the Tweeters on the roof of your car.
That's about it ......no..no..no..
5) Birds Test Sound " Stress Sound" Cd/USB/SD. without this you can't test or evaluate the area. ( Can purchase from my Blog)
All wires are jointed together thru the holes .
This is the Amplifier with USB/SD card ready. Slot in a Pendrive or Sd card with Strees Sound and it is ready to test birds.