SkyCaddie SG2.5The SG2.5 is for golfers who want advanced capability in a sleek, ultra-light design. In addition to getting distances to bunkers and other hazards on the course, the SG2.5 is equipped with the patented IntelliGreen® technology, enabling golfers to measure the full depth and shape of the green from any angle of approach, both on or off the fairway. At only 3.8 ounces, it is the lightest and most compact rangefinder on the market. Patented IntelliGreen® technology Advanced GPS technology designed for golf Easy to use, one-handed operation Powered by a lithium rechargeable battery Compact, durable and lightweight Water resistance for play in all weather conditions Product Highlights Patented IntelliGreen® technology Advanced GPS technology designed for golf Easy to use, one-handed operation Powered by a lithium rechargeable battery Compact, durable and lightweight Easy to use, one-handed operation Powered by a lithium rechargeable battery Brilliant, outdoor-readable display with automatic backlight Rugged, water-resistant case Drop-in lithium-rechargeable battery User-selectable display themes Patented Intelligreen® technology Water resistance for play in all weather conditions. Minimum System Requirements PC with Microsoft Windows 2000/XP/Vista Mac OS 10.3.9 or above, Intel or PowerPC processor 256 MB of RAM 4 MB of available hard disk space 2X CD-ROM drive (optional) Available PC USB 1.1 or 2.0 port Internet access Microsoft Internet Explorer 6.0 or higher