 A whole-term monitor is a small electrocardiography device that tracks heart rhythms and records heart beats. Pre-procedure, men are recommended to shave off excessive chest hair. After applying gel on the chest, the technologist will place electrodes that sense your heartbeat. The technologist then connects the electrodes to a recording device with several wires and instructs you on how to wear the device. Once monitoring begins, you must wear the halter monitor during all times of the day and night. Please remember to wear loose fitting clothes and not wet the monitor. Keep distance from metal detectors, magnets, microwave ovens, etc. Halter monitoring is usually recommended for 24-48 hours and is painless and non-invasive. Once the monitoring period is over, you have to come back to OPD to have the electrodes removed. Reports are issued after three hours of the detachment of the device.