Product Overview: Aim Quantum Rangefinder A sleeker, faster rechargeable laser rangefinder. The aim Quantum is smaller and the measurement speed is faster. It is compact, light, and small enough to fit in your pocket. With ZST+ technology, the measurement speed is increased to .15 sec. Features: Micro mini size & 7x Magnification viewfinder Zero-Second Tech+ that picks up accurate readings in 0.15 sec Slope ON/OFF mode with Green or Red LED light Rechargeable-Li-ion battery(A fully charged battery can be used at least 5,000 times) USGA/R&A legal for handicap& tournament play