When you exercise you don't always have to push your body to failure to get the most out of your training session. The Polar H7 heart rate sensor allows you to Listen to your heart to train at the right intensity, and stay in your target heart rate zone to get the maximum benefit from your heart rate training.The Polar H7 heart rate sensor connects to your smart device (iPhone 4S or higher, iPod Touch 5th generation or higher, iPad 3rd generation or higher, iPad mini and Android devices using os 4.3 or later) using Bluetooth Smart, keeping the battery drain low on both devices.The H7's soft fabric chest strap seamlessly adapts to your body shape, bringing full freedom of movement to your training. The Polar H7 heart rate sensor provides live heart rate data on the Polar Beat application. When used together you can gain access to even more of the app's features, including smart calorie tracking, Sport Zones for finding the right intensity for your workout, and deeper analysis of your workout's training benefit. Polar H7 heart rate sensor is part of a complete system. When used with a compatible smart phone, it will require an application supporting heart rate functionality for Bluetooth 4.0 low energy. H7 can also communicate with Polar compatible fitness equipment & Polar 5kHz training computers.Features- Uses low energy Bluetooth smart technology and coded 5 kHz transmission, providing ECG-accurate heart rate to any Bluetooth smart ready device and compatible Polar training computers- Provides live heart rate on your mobile training application, including the Polar Beat app, to make the most of every session- Long transmission range (~10m)- User replaceable battery- Includes a soft and comfortable hand washable fabric chest strap