Professional NIRSOfficial accessories · Muscle Oxygen NIRS Sensor
Muscle oxygen sensor Train.Red FYER 2.0 + app
Why muscle oxygen (SmO₂%)?
While athletes invest in gear, training plans and supplements, the true engine of performance is often overlooked: the muscles. Train.Red's Near-Infrared Spectroscopy (NIRS) technology reveals how key muscle groups respond to each effort, accumulated fatigue or altitude protocol.
Monitor muscle oxygen saturation in real time with a high 10 Hz sampling frequency.
Long-lasting battery for endurance training, racing and altitude training camps.
Visualise intensity zones, physiological limits and recovery with no monthly subscription.
Connect over 10 FYER sensors simultaneously to 1 device for teams or bilateral testing.
What's in the box?
- 1× Train.Red FYER 2.0 Sensor
- 1× USB fast charging cable
- 1× Patch Pack (20 adhesive patches)
- 1× Strap Pack (straps sizes S, M and L)
- 1× Waterproof USB sealing plug
- 1× Hard shell carrying case
Technical specifications
| Dimensions | 1.2 × 4.4 × 5.9 cm (0.5 × 1.7 × 2.3 inches) |
| Weight | 20 grams (ultralight and discreet while running or cycling) |
| Measurement depth | Up to 20 mm into muscle tissue |
| Emitter-detector distance | Up to 35 mm |
| Data frequency | 10 Hz (10 SmO₂ readings per second) |
| Battery life | Up to 20 hours of continuous active use |
| Connectivity | Bluetooth Low Energy (BLE) and ANT+ |
| Motion sensors | Integrated IMU with gyroscope and accelerometer |
| On-board memory | Your data is always safe even if the wireless connection drops |
| Water resistance | Yes (submersible using the included waterproof plug) |
| Materials | High-durability sports biocompatible ABS and TPE |
Ready to train with physiological precision?
Add the Train.Red FYER 2.0 sensor to your training sessions and get the most out of your simulated altitude workouts.
Buy Train.Red Sensor · 715 €