An event monitor (King of Hearts) is similar to a Holter monitor but can be worn for a longer period of time, up to 30 days. The King of Hearts monitor will measure your EKG only when you push the event button on the monitor. You should push the button only when you feel a symptom. Each pressing of the button causes the device to record for a period of one minute. This information will then be transmitted via a standard phone connection to a center with compatible receiving and rhythm printing equipment. For symptoms that may not happen every day, an event monitor is an effective way to detect an arrhythmia.