ET Bird Control 2000 (Electronic Bird Repeller) Used by professional Pest Control Companies for Pigeon Control and other Birds etc. Powers Birds Away with High Impact Sonic Sounds, Ultrasonic Sounds and Disturbing Strobe Lights Startles Birds with its Passive Inferred Motion Detection Bird Sound Confusion Switch for Optimum Repelling Easy Application Shell | Battery Operated or Plug-in | Covers up to 915 Square Feet