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UPGRADE YOUR COMBI RETINOSCOPE TO LED TECHNOLOGY (STREAK BEAM ONLY) Exclusive Neutral LED Technology LIFETIME WARRANTY ON THE LED. UP TO 300% ON TIME vs non-LED. BCS Technology BCS Technology The Easiest and most accurate refraction from the BRIGHTEST illumination, increased CONTRAST, and SHARPNESS in your hands. Quick Overview LED Module retinoscope > Better Resolution > 3X longer battery life