Due to possible interference with electronic medical implants, EGYM does not recommend using our devices if you wear a pacemaker or ICD.
Info on the differences between the two devices:

The ICD detects dangerous, too-fast arrhythmias and stops them with electrical stimulation (antitachycardic pacing) or a "shock" (defibrillation). Like a pacemaker, the defibrillator remains in the body.