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the heart rate sensor, wear it over a shirt, but moisten the shirt well under the electrodes to ensure flawless
operation.
The combined impact of moisture and intense abrasion may cause a black color to come off the heart rate
sensor’s surface, possibly staining light-colored clothes. If you use perfume or insect repellent on your skin,
you must ensure that it does not come into contact with the training device or the heart rate sensor.
TECHNICAL SPECIFICATION
M400
Battery type: 190 mAh Li-pol rechargeable battery
Operating time: In continuous use:
Up to 8 hours with GPS and heart rate
sensor
In time mode with daily activity mon-
itoring:
Approximately 30 days
Operating temperature: -10 °C to +50 °C / 14 °F to 122 °F
Training device materials: Stainless steel, Polycar-
bonate/acrylonitrile butadiene styrene,
Acrylonitrile butadiene styrene, Ther-
moplastic urethane, Poly-
methylmetacrylate, Silicone
Watch accuracy: Better than ± 0.5 seconds / day at 25 °C
/ 77 °F temperature
GPS accuracy: Distance ±2%, speed ±2 km/h
Altitude resolution: 1 m
Ascent/Descent resolution: 5 m
Maximum altitude: 9000 m / 29525 ft
Sample rate: 1 s
Accuracy of heart rate monitor: ± 1% or 1 bpm, whichever larger. Defin-
ition applies to stable conditions.
Heart rate measuring range: 15-240 bpm
Current speed display range: 0-399 km/h 247.9 mph
Water resistance: 30 m (suitable for bathing and swim-
ming)