Train.Red FYER Sensor
Train.Red FYER Sensor
Train.Red FYER Sensor
Train.Red FYER Sensor

Train.Red FYER Sensor

Regular price€600,00
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The FYER is the smallest and most innovative wearable muscle oxygen sensor in the world. To improve your performance, you invest time and energy in equipment, standardized training programs, supplements, etc., but often we forget the one thing that drives our performance: our muscles.


Our FYER muscle oxygen sensor comes with: the Train.Red FYER, a charging cable, one Patch Pack (20 patches), and one Strap Pack (S-M-L) all in a durable travel-pouch.

    Train.Red tracks your muscle oxygen in real time with sensors. Our smart app translates this muscle data into key features to guide athletes to improve their performance.


    - Size: 1.2 x 4.4x 5.9 (cm) / .5 x 1.7 x 2.3 (in)
    - Weight: 20 grams
    - Measure-depth: up to 20mm in your muscle
    - Light source & detector distance: up to 35mm
    - Sweat-proof: Yes
    - Battery: up to 24 hours during active use
    - Speed: 10Hz
    - Connectivity: BLE and ANT+
    - Materials: high-quality biocompatible ABS and TPE

    Connect your fyer

    Train.Red APP: available on Android devices and in the near future iOS devices (development not completed)
    In app exporting: unfiltered data to .Fit file or .CSV

    Compatible with: V02Master Manager, Splendo Health & Fit, ANT+ profile like Garmin, Wahoo, etc. As well as Garmin data field

    Train.Red shines a light on your performance based on light technology, the FYER looks inside your muscles with Near InfraRed Spectroscopy (NIRS). The sensor translates the oxygen saturation and (de-)oxyhemoglobin changes in your muscle tissue into real-time key features with the help of artificial intelligence and a friendly user interface.

    Scientifically proven by our partner Artinis medical systems, with over 1500 publications.


    Gain strength and/or endurance by using the data from your muscles.

    • SmO2%, Muscle Oxygen or Tissue Saturation, is the amount of oxygen in your muscle tissue (%). Adjust your pace in real-time or analyze afterward
    • Determine if your muscle is working hard, or hardly working. 5 muscle states are visualized in real-time. Stay in the green state during easy sessions, or go in the red during efforts. Learn more
    • High-performance coach or hobby scientist? Measure the Oxy-, and DeOxyhemoglobin concentration changes, or use the total hemoglobin and hemoglobin difference to your advantage.