The heart rate transmitter quickly and accurately measures your heart rate and transmits it to any device with a 5.3khz uncoded receiver. This water-resistant, open frequency transmitter features an adjustable, elastic strap (61cm-93cm) that fits most chest sizes and ensures a comfortable, customised fit. The device is lightweight and durable and has a transmission distance of 100cm/39.4” (max. 140cm/55.1”). It is supplied with a replaceable CR2032 battery and provides reliable pulse measurement to let you maximize results with heart rate training.