You can't trust the club if you can't trust the caddie! The SkyCaddie SG2.5 integrates SkyGolf's advanced GPS technology to provide unmatched reliability. The SG2.5 includes SkyGolf’s patented IntelliGreen® technology, enabling golfers to measure the full depth and shape of the green from any angle of approach and shows distances for all targets and hazards on any of SkyGolf’s many thousands of professionally mapped courses. SkyGolf SG2.5 GPS Digital SkyCaddie features: Large LCD viewing screen with backlight Instant distances to targets and hazards Durable, water-resistant case Patented IntelliGreen® technology Battery level indicator Outdoor readable display Sleek, ultra-light design SkyGolf SG2.5 GPS: Lithium-ion battery (14 hour battery life) USB cable for connectivity with your PC Comes with user guide Weighs 3.8 oz Size: 4"H x 2.2"W x 0.8"D Minimum System Requirements* PC with Microsoft Windows 2000 & up 256 MB of RAM 4 MB of available hard disk space 2X CD-ROM drive (optional) MAC compatible Internet access *Please Note: SkyPlayer membership is an annual subscription that gives you automatic software updates, theft deterrent, and online storage of your SkyCourses in your own personal SkyVault, as well as access to professionally-recorded courses. Three different levels of memberships available, based on how many courses you want to store and play- fee required. SkyGolf...The True Measure Of The Game!