Suunto Comfort Belts send accurate heart rate information to a compatible Suunto wrist unit with 100% disturbance-free ANT technology.Suunto"s Comfort Belt textile strap is now available with dual technologies: ANT (65,500+ frequencies, providing interference-free digital radio transmission) and Coded (29 codes, open transmission that allows talk with cardio gym equipment)Made from comfortable textile materialsStays snug to the body with unique traction stripsQuick and easy battery replacementExtremely light weightDesign offers improved fitting comfort, essential in sporting activitiesEasy to use: closing mechanism conveniently placed in front, symmetrical length adjustmentExtremely thin length-adjustment buckles minimize the risk of friction and abrasions