High-performance, smaller-sized multisport GPS watch for athletes and outdoor adventurers Tracks activity including heart rate, steps and sleep Features wrist-based controls for maps and music Compatible with Android OS 4.4+ (excluding Go edition) or iOS 9.3+ devices Powered by Gamin's propriety wearable operating system Stainless steel; sapphire crystal Case size: 42mm Water resistant to 10 ATM Digital movement Black sunlight-readable digital display Stainless steel link bracelet Deployant clasp closure Manufacturer's 1-year limited warranty