Digital Heart Rate Monitoring Kit (Internal plug-in) + ANT

Digital Heart Rate Monitoring Kit Compatible with the Series 4 monitor and must be connected internally. Digital Heart Rate Kit allows the receiver to be placed internal, or adjacent to the monitor removing the need for unsightly extension cables. Further. ANT+ digital wireless technology greatly improves the range and accuracy of heart rate information and is becoming widely adopted by industry leaders such as Cardio Sport, Garmin, Timex etc. ANT+ Heart Rate Monitoring is compatible with Series 4 version 2 or newer WaterRower monitors only.