vdo chest belt transmitter and strap for the z2 z3

The robust ANT wireless heart rate monitor This premium edition is equipped with super soft, exceptionally comfortable chest strap Offers superior battery life Eliminates cross-talk with other devices to reliably measure and send heart rate data to help you train in your zone 

Premium HRM Transmitter Strap Black 

The Ekho G8 GPS Heart Rate Monitor is the force in GPS training, offering everything beginners to super elite athletes need. The Ekho G8 tracks your time, distance, pace and heart rate, then sends the data to your PC for later analysis. Each workout is stored in large internal memory so you can review and analyze the data and understand how you've improved. Ekho G8 GPS Heart Rate