Polar M400 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.

Polar Flow

Polar Flow web service and app help you stay on track with your daily activity and training.

• Quick visual overview in the app 
• Free app compatible with Android (4.3 and later) and iOS
• Deeper insight and analysis in the web service
• Connect your Flow account with Strava

Running Program

Train for a running event with a personal and adaptive training plan in Polar Flow. Choose from four different targets, 5K, 10K, half marathon and marathon, and get a training plan that fits you and your goals.

Built-in GPS

The M400 tracks your ride, run or hike with the integrated GPS sensor. It measures your speed, distance and route, guides you back home and counts your Running Index, showing how your performance is developing.

Smart Notifications

Get alerts from incoming calls, messages and push notifications from social media apps to your wrist and stay in the know with the M400, wherever you are.

Bluetooth® Smart Sensors

Pair up the M400 with Polar H7 Bluetooth® Smart heart rate sensor to measure your every heartbeat during training, and find out if you're mostly burning fat or improving your fitness. This is the most accurate way to measure burned calories in heart rate based training.

The Stride sensor Bluetooth® Smart is ideal for runners who want to improve their technique and performance. Whether you're running on a treadmill or the muddiest trail, you'll see information about your speed and distance on the M400's display.

Fitness Test

Polar Fitness Test measures your aerobic fitness at rest in just five minutes. The result evaluates your maximal oxygen uptake (VO2max). Fitness testing will motivate and inspire you to start, maintain or increase physical exercise.

Training Benefit

Get motivating feedback immediately after exercise by syncing your M400 with Polar Flow app or web service.

Running Index

Running Index is based on your heart rate and speed data measured during the run. It gives you information about your performance level, both aerobic fitness and running economy. Improvement in running efficiency indicates improved economy of running performance.

Smart Calories

The most accurate calorie counter on the market calculates the number of calories burned. The calculation is based on your individual data: your weight, height, age, gender and the intensity of physical activity.

MEASUREMENTS

Weight56,6g

Thickness11,5 mm

Display size128 x 128 px high resolution display