Nymi Blog

4 Tips for Improving your ECG Reading

Posted by partclay on Feb 18, 2015 4:04:00 PM

The Nymi Band is the only wearable that uses your heart’s unique signature to confirm identity. The continuity of the band itself then allows for persistent identity, meaning your Nymi Band continues to know who you are until you un-clasp it.

When you first set up your Nymi Band and during subsequent activations, it’s important to capture a high quality biometric signal - in this case, your ECG. The better the quality of the signal, the more reliable your activation experience will be.

For those of you who have received the Nymi Band Discovery Kit, we’ve outlined 4 tips that will help you create a high quality biometric template and help you ensure that your daily authentication goes smoothly.

Everyone’s ECG is unique and behaves a little differently, so we encourage you to try some or all of these tips to achieve the best performance when using your Nymi Band.


Make sure your finger covers as much of your Nymi Band’s top sensor as you can without applying an excessive amount of pressure. Using your index (pointer) finger yields the best results. Before you put your finger down, it’s also a good idea to check and ensure that the Nymi Band’s bottom sensor is far enough up your wrist so that it is resting on your skin and not on your wrist joint.


The Nymi Band needs to make contact with your skin so that it can pick up on the electrical circuit in your body. One of the things that can impede a clear signal is dry skin. Since the Nymi Band uses dry electrodes to pick up your heart’s electrical signal, a little bit of moisture can provide better connectivity and a better reading. Again, everyone is different and atmospheric conditions such as humidity and cold will affect your skin. Sanitizing the areas where the Nymi Band makes contact with your body (the wrist and index finger in this case) before creating your biometric template, and when you activate your Nymi Band, can help improve the quality of the signal.


During the set-up process especially, make sure you are positioned comfortably, preferably seated, with your arm resting on a table. This will help reduce the amount of noise that is picked up by the Nymi Band’s sensors and will give you a higher quality biometric template. Another thing you can try is standing up during the enhancement process (where you improve your biometric template by adding more data). We have found that standing up can improve the quality of the signal for some users.


If none of the steps above achieve reliable authentication for you, try reversing the Nymi Band around so that the Core of the Nymi Band is on the underside of your wrist. Your ECG signal is typically is stronger here and once enrolment is complete, you should be able perform your daily activation while wearing the band normally.

We hope these tips help you get the most of our your Nymi Band and make your authentication smoother. Remember: the more robust your biometric template is, the easier it will be for your Nymi Band to recognize you. For this reason, we recommend that all users should enhance their biometric profiles at least twice using the “Enhance” feature in the Nymi Companion App.

If you need further assistance then please don’t hesitate to contact the Nymi Support by emailing us at help@nymi.com or reaching out to us on social media (FacebookTwitterGoogle+) and we will be happy to assist you further.

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