SkyCaddie SG4 Golf GPS (Gray/Black) Full-featured golf GPS with water-resistant shell for play in all conditions Includes IntelliGreen technology with full depth and shape of the green from any angle of approach Plot greens yourself, or subscribe to one of three SkyCourse memberships for access to up to 16,000 courses Programmable memory module to store thousands of targets, auto-hole advance, large grayscale LCD Rechargeable battery provides up to 12 hours of continuous use