I have been training with heart rate for over 20 years. I use a Garmin Edge 1000 and my smartphone. The transmitted data are completely unreliable and are displayed identically and incorrectly by my devices.
I have a HRmax of 172 bpm. With the transmitter, for example, my Garmin shows 165 HR, while I'm having a conversation at around 120 HR. At night my smartphone shows me a resting heart rate of 40 HF. In reality, my resting heart rate is 55 HF.
Heart rate training or documentation of HR values is excluded. That's why it's a pointless device that you shouldn't buy.
The unreliable and complicated customer service confirms that the data transmission is not correct and that a delay of 8 to 0 seconds must be expected.
