This compact and comfortable chest strap features dual transmission, which means it can simultaneously connect to both ANT+ and Bluetooth Low Energy (BLE) devices, allowing you to easily view your heart rate data on multiple devices at once.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