64
1. Usinga coin, open the battery
coverby turning it coun-
terclockwise to OPEN.
2. Insertthe battery (CR 2025)
insidethe cover with the positive
(+)side against the cover. Make
surethe sealing ringis inthe
grooveto ensurewater res-
istance.
3. Pressthe cover back into the con-
nector.
4. Uset hec oint o turnthe cover
clockwise to CLOSE.
Dangerof explosioni f the battery is replacedwit h wrongty pe.
PRECAUTIONS
ThePolar M400training device shows your performanceindicators. The trainingdevice is designed to indicate
thelevel of physiological strain and recoveryduring andafter an exercise session. It measuresheartrate,
speedand distance. No otheruse is intendedorimplied.
Thetraining devices houldnot be used for obtainingenvironmentalmeasurementst hat requireprofessionalor
industrialprecision.

INTERFERENCE DURING TR AINING

ElectromagneticInterferenceand Training Equipment
Disturbancemay occur nearelectrical devices. Also WLAN basestations may cause interferencewhen train-
ingwith the training device. To avoid erraticreading ormis behavior,move away from possible sources of dis-
turbance.
Trainingequipmentwith electronic or electrical componentssuch as LED displays,motors and electrical
brakesmay cause interferingst ray signals. To solve these problems,try t hefollowing:
1. Removethe heart rate sensorst rapfrom your chest and use the trainingequipment as you wouldnor-
mally.