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UPC 605930624700
The HS515CM is a micro red dot optic. The operator can switch from a 2 MOA dot to a 65 MOA circle dot with a push of a button. Holosun's highly efficient light emitting diodes and solar panels allow Holosun solar optics to run without a battery in many lighting conditions. 
Additionally, the back-up battery lasts up to 5-years on the dot and up to 2 years on the circle dot. The U signifies a housing design that shrouds the windage and elevation turrets on two sides. This product includes clear flip-up lens covers, a quick release mount and a kill flash filter.