Perfect fit for:

Multi-device connection

Size

Weight

Measure depth

Light source & detector distance

Number of Channels

Sweatproof

Waterproof

Battery time (up to)

Speed

Export Data

Export speed

BLE & ANT+

Haptic feedback

IMU

Onboard storage

Offline mode on sensor

USB C

APP iOS & Android

Real-time Data

+

Post session Data

|

3rd Party

Enthusiasts, Athletes, coaches & education

✔️ (10+ per smartphone)

1.2 x 4.4 x 5.9 cm / 0.5 x 1.7 x 2.3 inch

20 grams (lightest in its class)

up to 20 mm

Up to 35mm

1 (64 micro channels)

✔️

✔️ (with plug IPX7)

up to 20 hrs of active use

10 Hz

✔️ (CSV, FIT, & Report)

10 Hz

✔️

✖️

✔️ (9 axis)

✖️ 1.0, ✔️ 2.0

✖️ 1.0, ✔️ 2.0 (1000+ hours of data)

✔️

✔️

Muscle Oxygen (SmO₂% as number & graph), Muscle States (1-5), MSS (Muscle Stress Score), Recovery phases, Fuel/Use ratio, Muscle Trend.

SmO₂%, Relative O2Hb, HHb, HbDiff, tHb, Laps, Muscle States and Trend, Muscle Stress, time in Muscle States and IMU data in export file.

The Train.Red FYER 1.0 only shared SmO₂%, HbDiff, and Muscle Trend data with third parties. Version 2.0 also includes Muscle States and your latest sensor profile.

The FYER is an excellent sensor for anyone wanting to get started with muscle oxygen and looking to get more serious about training. This sensor offers everything you need in just 20 grams of tech. Great for sports enthusiasts, athletes, coaches, and education.

Coaches, exercise labs & education

✔️ (10+ per smartphone)

1.5 x 4.4 x 6.8 cm / 0.6 x 1.7 x 2.7 inch

26 grams

up to 25 mm

Up to 40mm

6 channels

✔️

✖️

up to 18 hrs of active use

100 Hz (fastest in its class)

✔️ (CSV, FIT, & Report)

10 Hz

✔️

✔️

✔️ (9 axis)

✖️ 1.0, ✔️ 2.0

✖️ 1.0, ✔️ 2.0 (1000+ hours of data)

✔️

✔️

Muscle Oxygen (SmO₂% as number & graph), Muscle States (1-5), MSS (Muscle Stress Score), Recovery phases, Fuel/Use ratio, Muscle Trend.

SmO₂%, Relative O2Hb, HHb, HbDiff, tHb, Laps, Muscle States and Trend, Muscle Stress, time in Muscle States and IMU data in export file.

The Train.Red PLUS 1.0 only shared SmO₂%, HbDiff, and Muscle Trend data with third parties. Version 2.0 also includes Muscle States and your latest sensor profile.

The PLUS is recommended for people who already understand muscle oxygen and are looking for the most accurate data. Perfect for exercise labs, education, and coaches.