Our powerful green kaleidoscope laser pointer features a highly visible green color and operates at the 532 nm wavelength. You can actually see the beam, not just the point. Great to use as an astronomy pointer to explore the night sky. Our Kaleidoscope Green Laser Pen comes with a removable lens filter the lights up the entire ceiling or wall with a cool laser display. This Powerful Laser Pen is about the size of a small flashlight.