The ithlete ECG receiver is a small piece of hardware that picks up the signal from your heart rate monitor chest strap.
It plugs into the headset jack of your Apple, Android or Tablet device. The ithlete ECG receiver picks up the wireless signal sent from your HRM chest strap. This allows the time gaps between your individual heart beats to be measured very precisely by the ithlete app.
This is the best choice for someone who wants to use ithlete with their existing compatible HRM chest strap.
You do not need the ECG receiver to be attached when you review your results and progress in the Chart view or Edit view.