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The HRM-Dual is designed to deliver reliable and accurate heart rate data, even in the toughest workout conditions. It features an adjustable strap that fits securely around your chest, and the soft, comfortable fabric ensures a comfortable fit during prolonged workouts. The HRM-Dual also has a replaceable battery, which provides up to three and a half years of use.Soft and adjustable strap for comfortTransmits real-time heart rate dataStrap is washable when the module is removedModule: 62 mm x 34 mm x 11 mmStrap Length: 63.5 cm to 132 cmWeight: 54.4 gWater Resistance: 1 ATM*Battery: User-replaceable size CR2032 (3 volts)Battery Life: Approximately 3.5 years (based on average use of 1 hour per day)Operating Temperature: -5°C - 50°C