Polar H7 Bluetooth Smart Heart Rate Sensor
The Polar H7 heart rate sensor provides live heart rate on your mobile training application, including the Polar Beat app, to make the most of every session. In addition to low energy Bluetooth smart technology, the H7 heart rate sensor uses coded 5 kHz transmission to connect with the majority of Polar training computers on the market and with compatible gym equipment. The soft fabric chest strap seamlessly adapts to your body shape, bringing full freedom of movement to your training.
Please see this link for its replacement.