Offering the most reliable, consistent and accurate way to monitor your heart rate, the Viavito heart rate transmitter is suitable for use with any device that’s fitted with a 5.3khz uncoded wireless receiver. With an adjustment range of 61cm-93cm (24″-36.6″), the strap fits most chest sizes and ensures a secure, comfortable and adaptive fit to let you focus on maximizing training results. This open frequency transmitter is both lightweight and durable and delivers superb reliability to help you get the most out of your cardio training. The chest strap comes with a replaceable CR2032 battery and has a transmission distance of 100cm/39.4″ (max. 140cm/55.1″).