High performance PhotoChromatic Technology™ automatically darkens in bright light to dull pins, prevent pin halo. Patent #7290345. The revolutionary SkyCoil™ gathers light from above for unmatched pin brightness when you need it! Calibrated horizontal and vertical gang adjustment. NEW, lighter X-Frame base. Level Head sight ring with pre-installed level that’s much easier to adjust and far more secure. Level level can be customized to fit into top of sight ring. Machined aluminum guard for maximum durability and pin protection