Hook up your fitness Polar H7 Heart Rate Sensor to your favourite fitness app to get live, accurate information when you're exercising Compatible with dozens of fitness apps including the Polar Beat app, it lets you keep track of your heart rate as you train and fits comfortably around your chest. This helps you to understand your body and get the most from your workout. Compatible with iPhone 4S and later, along with selected Android 4.3 and above phones, it also syncs with compatible fitness equipment such as the Polar Loop Activity Tracker (item number 4FMPU) to add another dimension to your fitness goals. Useful info:

• Fits size M-XXL
• Work with Polar fitness apps and devices
• Compatible with iPhone 4S and later
• Selected Android 4.3 and above phones
• Polar H7 Heart Rate Sensor