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When the Bird Daylight Laser 200 emits a powerful green light that hits bird feathers, it makes a bright splash of light. Which traumatizes them and they can't fly away fast enough. A flock of more than 100 geese immediately took flight..
Today, more powerful laser levels can be used indoors or outdoors, and many are designed for use with a light detector that reads the laser's light. These devices are positioned away from the laser's diode, then moved up or down until the projection is detected and signaled in response with a beep or blink.