Optimized for a perfect running experience, the Suunto Ambit2 R features a built in GPS and accelerometer to provide accurate pace, speed, cadence, and distance while full route navigation offers you the freedom to explore. Training plans, running apps, and optional heart rate monitoring make it easy to improve and keep track of every aspect of your performance. . Full featured GPS with adjustable GPS fix rate provides waypoint and route navigation, location in multiple coordinate systems, track logging, POI creation, and find back functionality. GPS corrected barometric altimeter provides total ascentdescent, vertical speed data, and an altitude graph. Run specific features include GPS based speedpacedistance, training plans, heart rate data and calorie expenditure requires HRM sold separately, Peak Training Effect and recovery time, manual and autolaps, chronograph and countdown timer, EPOC and VO2 max data, and much more. Add extra functionality to your Ambit2 R with 1000s of free apps. Log your workouts and monitor your progress with an easy to use sports diary at Suuntos movescount.com. Rechargeable Li ion battery lasts up to 25 hr. depending on GPS fix rate, or 14 days in watch mode. Basic watch functions include time, date, dual time, and alarm. Robust, glass fiber reinforced casing and steel bezel are tough and durable TPU strap is comfortable and strong. Water resistant to 50 m 164 ft.. ANT enabled. Compatible with Suunto ANT Heart Rate Belt, Dual Comfort Belt, and Foot Pod Mini each sold separately.