Product Overview: Introducing the CSI Pro Laser Rangefinder from Callaway. Features: The Callaway CSI Pro Laser Rangefinder delivers all the distance measurement features golfers require to maximize their game, enhanced by a unique new feature called Club Selection Information (CSI). CSI works as your own personal caddie, making club suggestions based on your average 7-iron distance which you plug into the unit. Ultra compact size & lightweight (5 oz) 6x magnification Range: 5 - 1,000 yards Superior accuracy within +/- 1 yard Slope Technology: measures angle of incline/decline for slope-adjusted distance Scan landscape to acquire multiple targets at once Pin Acquisition Technology (P.A.T.) quickly locks onto pin up to 300 yards away Magnahold - strong, integrated magnet allowing you to securely affix to cart frame for convenient access External on/off slope switch; legal for tournament play Powered by a CR2-3V battery Water/Fog resistant Includes premium molded hard case with bungee cord closure; lens cleaning cloth 1 year limited manufacturer's warranty