Question 1

Does the Fourth Frontier X3 show an ECG?

Accepted Answer

Not officially. X3 samples an ECG inside the pod to calculate its metrics, and Fourth Frontier says it does not show, stream or export the trace. Fourth Frontier keeps the trace for its FDA-cleared Frontier X Plus. During my testing, the web dashboard did show the trace for X3 sessions, which is an oversight.

Question 2

Is the Fourth Frontier X3 accurate for heart rate?

Accepted Answer

Yes. In my testing it averaged within 2 bpm of my Polar SENSE reference across more than 10 sessions.

Question 3

Does the Fourth Frontier X3 work with Garmin?

Accepted Answer

Yes. X3 broadcasts heart rate over Bluetooth to Garmin watches and bike computers, and it can connect to two devices alongside your phone. It does not support ANT+, and syncing workouts to Garmin Connect requires Frontier Premium.

Question 4

Can you swim with the Fourth Frontier X3?

Accepted Answer

X3 is rated IP67, which covers immersion in fresh water to about 1 metre for 30 minutes. It is not rated for salt water, and Fourth Frontier advises wearing it under a tight suit when swimming.

Question 5

What is the difference between the Frontier X3 and the Frontier Zone?

Accepted Answer

X3 lasts up to 4 months between charges compared with up to 30 days for the Zone. The Zone shows and exports the ECG trace with a Frontier Premium subscription, which X3 officially cannot do. X3 is sold in the US, and the Zone in the UK and Europe.

Question 6

Where can I buy the Fourth Frontier X3?

Accepted Answer

Fourth Frontier sells the X3 through its US store. Code 5KRUNNERX3 takes 30% off. It is not sold through Fourth Frontier&#8217;s UK and Europe store.

Tag: Frontier X3

Frontier X3 review – ECG accuracy without the ECG trace