The iRythm Zio patch is a wearable sensor used to monitor arrhythmias in cardiac patients for up to two weeks. While it is a continuous monitor, the device also has a large button on top for patients to capture symptomatic events. This is an alternative to the 24 hour Holter monitor. The FDA approved device does not wirelessly transmit data to a mobile device. Readings are stored in the patch itself, which is then mailedto iRhythm at the end of the monitoring period. iRythm analyzes the data and produces a report for the physician.