A little known fact about the Amazfit GT 4 range is the fact that these devices can connect to external heart rate monitors.
This is actually a pretty big deal and it is strange that Zepp Health has not done more to publicise the news. We stumbled across the feature by accident while testing the Amazfit GTR 4.
It works only via Bluetooth, so there is no ANT+ compatibility. But if you head over to the settings page on the watch and select Bluetooth, you’ll notice a menu option that says Workout accessory. Click on that and you will have the ability to add external devices by tapping the little + sign.
Once they are added, whichever device is switched on will automatically connect when you start an exercise. You’ll get a message letting you know the connection was successful.
In our testing of the device we tried adding a couple of different Bluetooth heart rate monitors, and they all worked without a hitch. The connection was quick and fast and the GTR 4 has not trouble at all finding the external devices.
We have not tested the GTS 4 so cannot confirm whether that device also has the ability. But there is no reason to assume that it doesn’t as pretty much the only difference between the GTS 4 and GTR 4 is the design.
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Anyone who is serious about their athletic pursuits will be excited about this news. As good as heart rate sensors from the wrist have become, they still lag behind heart rate chest straps when it comes to monitoring heart rate during exercise. This is particularly the case with high-intensity workouts.
You have to go back a while to find the last Amazfit watch with support for external heart rate monitors. In fact Stratos watches are the only devices that support this. And the last timepiece from that line dropped back in August 2019. There was speculation we might see Stratos 4, but the device doesn’t seem to be on the horizon.
We have been very impressed so far with the GTR 4. Improvements across-the-board are evident. The dual-band GPS functionality works great, as does the BioTracker 4.0 PPG optical sensor. With the ability to connect to external heart rate monitors, this is now a much more serious sports tracking device.
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