The redesigned V3n brings greater reliability to an already feature-packed computer. 2.4 Ghz digital wireless technology eliminates interference & crosstalk, tracks speed, cadence, & heart rate. The all-new detachable fabric HR sensor is designed to be more comfortable than tradition chest straps. Two programmable heart rate zones with an audible alarm help you keep track of your workload along with displaying your current, average, & max heart rate data.