A Cardiac Event monitor is a device that is used to record the electrical activity of the heart for up to 30 days at a time. When a patient experiences symptoms they push the Record button on the Cardiac Event monitor and a cardiac event is recorded. An auto-trigger may also automatically record some non-symptomatic events. The patient then calls a cardiac lab to transmit their recording over the phone.

Throughout the extended period of the study transmissions sent from the Cardiac Event monitor are sent to the patient's physician for review. At the conclusion of the study the Cardiac Event monitor is returned and a final report is sent to the patient's physician. The physician then uses the information provided by the Cardiac Event monitor to diagnose and recommend further treatment for the patient.