Holter monitors are portable devices designed for continuous electrocardiography (ECG), allowing for the recording of a patient\'s heart activity over extended periods, typically ranging from 24 to 48 hours, with advanced models able to monitor for several weeks. These monitors are key in detecting irregular heart rhythms, or arrhythmias, which may not be evident during shorter ECG tests conducted in clinical settings. By providing real-time, continuous monitoring, Holter devices offer healthcare professionals a comprehensive understanding of the heart’s electrical activity throughout various daily activities, including sleep cycles, physical exertion, and periods of stress.