The Polar is an adjustable strap that is water resistant to provide you with an accurate reading of your heart rate. The pulse offers rate measurements with ECG accuracy. Please note: this strap will only work with machine or a device with a compatible POLAR receiver. GENERAL – POLAR T34 Wireless Heart Rate Monitor – Please note: this strap will only work with machine or a device with a compatible POLAR receiver. – Adjustable elastic strap included – Water resistant up to 100m – Lifespan of up to 5 years (at 10 hours of training a week) – Offers pulse rate measurements with ECG accuracy Compatible units with in built receivers – SP-950 Spin Bike – GOLD 2.0H Treadmill – VIPER Treadmill (strap already included) – ROWER-605 Rowing Machine (strap already included).12 Months Parts replacement warranty. .