Polar M400 GPS running watch with H7 Bluetooth Smart HR Sensor is an exceptional blend of sporty design, integrated GPS and advanced training features, along with plenty of options to keep an eye on your activity 24/7. The M400 gives runners the freedom to explore new, more adventurous routes: you can measure your pace, distance and altitude and find your way back home. Plan, sync and share your training using the Polar Flow app and web service. The H7 Bluetooth Smart Heart Rate Sensor provides real-time heart rate to compatible mobile training apps, including Polar Beat and Polar Flow, via low energy Bluetooth Smart technology. Also connects with the majority of Polar heart rate monitors on the market and compatible gym equipment. Includes a soft fabric chest strap that seamlessly adapts to your body shape. User replaceable battery.