POLAR PRESENTS A NEW AFFORDABLE HRM: When you're looking for a reliable high quality heart rate monitor for your everyday use, Polar H9 is a trusted choice of HR sensor that fulfills all your needs. GOLD STANDARD IN HEART RATE TRACKING: Built on decades of scientific research and development, recognized by both regular users and researchers around the globe, Polar is proud to be the Gold Standard in HR tracking. WORKS WITH EVERYTHING: Polar H9 works with ALL HRM compatible Equipment. MORE EFFECTIVE: Track your heart rate with Polar's high accuracy sensors. Choose you size: XS-S: 20' - 26', M-XXL: 26 - 36 TURN YOUR PHONE INTO A TRACKER: Enjoy endless connection possibilities with popular apps on your smartphone.