Ultrasound systems continuously emit high frequency sound waves, which are inaudible to the human ear but intensely irritating for birds. TONI's professional systems combine ultrasound with low-frequency infrasound for maximum effectiveness in bird deterrence.

Important characteristics of ultrasound systems

• Ultrasound systems consist of one or more speakers placed inconspicuously on a building or other structure to protect it in its entirety.
  
• Though humans cannot hear it, birds perceive the sound as physical pressure - intensely irritating, but not painful or dangerous.
  
• Acoustic pressure systems are suitable for low to medium populations of birds. 
• For the professional use, there are various ultrasound devices with differing effective radiuses. Acoustic pressure systems are quite small and can be hidden well on a building.

Available ultrasound devices

Pros

• Much less conspicuous than physical bird deterrents.
  
• Can be installed nearly anywhere
  
• Protects large areas
• Inaudible to humans
• Not dangerous to birds or humans

Cons

• Habituation possible
• Effect range of each speaker limited to ca. 10-18m
• Corners, ledges, etc. can cast a "sound shadow," reducing overall efficacy.
  
• The setting up of devices requires ornithological knowledge.

Downloads

• Planning documents Acoustic pressure, DWG-File
• Planning documents Acoustic pressure, TF2, PDF-File
• Planning documents Acoustic pressure, TF3, PDF-File