The red dot is NOT projected beyond the sight. Bright dot is visible under all conditions. See the dot, put it on the talent and open your douser. Perfect every time. Zero magnification means you can watch the whole stage and use the scope at the same time.
Magnetic base conforms to round or flat surfaces.
Powered by one readily available 3v lithium button battery . Unit does not have to be opened to replace the battery. Comes with high impact carrying case measuring 6x4x2 inches. That's handy when mounting to square bodied lamps. Xenon Super Troupers, etc.