Protects your pond fish from herons and other intrudersColorful fish in a clear pond are easy prey for herons, among others. In spring, herons are looking for food for their young. In summer when the young herons have fledged, they find themselves fishing at the water’s edge. In the fall, the food supply for herons is limited and pond fish are easy prey.Fish are the main food of the heron, but its long beak can also mortally wound large specimens. After a successful attempt, the heron will return until the pond is emptied. The Laser Guard’s motion sensor detects approaching intruders and has a range of about 12 meters at an angle of 100°. Operation is highly effective against herons, among others, through three methods: Flash light with variable frequency makes the environment unpleasantly agitated. Herons see the green laser beams as dangerous moving obstacles. The sound of a conspecific in distress, barking dogs and the terrifying cry of a deadly poison dart frog deter herons for good. This method of deterrence lasts 60 seconds at a time; the startled intruders will flee away so the fish are safe in the pond again.