cosinuss° One – Performance Monitoring

The Mobile Health Solution for Professionals.

The cosinuss° One is a professional fitness tracker monitoring multiple vital signs with stunning accuracy.

  • Heart rate
  • Body temperature
  • 3-D Acceleration

Inside this small and light ear plug the patented earconnect technology is taking vital sign monitoring to the next level. You can use the cosinuss° One with all devices featuring Bluetooth.

Heart rate & more. Without a chest strap.

The innovative in-ear sensor combines highest precision with ergonomics and comfort.
Heart rate measurements in the ear instead of using a restrictive belt around the chest? This is how it works.

In-Ear Wearable For Easy Vital Signs Monitoring

Easy to wear, skin friendly and multifunctional. That´s what the cosinuss° One is famous for.
Created to be more than a cheststrap. 

Better Breathing

Do you feel like you can’t breathe? A tight chest band around your chest when you’re running is restricting you? Take a deep breath because these days are over now! With a lightweight device in your ear nothing will keep you from performing your best anymore.

Free Movement

You rubbed on a scar from the last chest strap you wore? Or you can´t place it correctly because of your anatomy? Don´t worry anymore! We developed a fitting and ergonomic HR monitor for everyone to wear.

I especially appreciate the high level of comfort and the body temperature measurement.

I need an accurate way to determine my performance. The cosinuss °One provides the correct parameters

Ground-breaking Performance

Get hands on with cosinuss° earconnectTM technology. Upgrade your performance tracking and immediately increase your comfort and accuracy. No cheststrap anymore but more & accurate vital signs on your display.

Tomorrow´s Technology Today

  • Free Size Exchange

  • Free Return

  • Free Firmware Updates

  • Free cosinuss° App

*Note: Please note that the new sensor models of the cosinuss° One no longer support data transmission via ANT+. This applies to sensors with LOT number 2201 and higher. We explain where you can find the number on your sensor here Support FAQ °One.

More In-Ear Sensors

c-med° alpha

The c-med° alpha combines two medical measuring devices in one: thermometer and pulse oximeter.


The degree° is a small, convenient infrared ear thermometer for children.


The °Two is a multi-parameter sensor in the ear. Often used in scientific and medical studies.


The °Temp is a reliable temperature tracker in the ear. Often used in scientific studies.