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A green laser pointer emits a bright, highly visible green light beam, often operating at a wavelength of 532 nanometers. It is significantly brighter to the human eye compared to red lasers of the same power, making it ideal for use in presentations, astronomy, stargazing, or outdoor signaling. Green laser pointers are typically powered by batteries, are portable, and may include adjustable focus, safety features, and a durable casing. They are popular due to their precision and long-range visibility.