The aims of this study were (1) to identify research publications studying non-invasive ECG monitoring devices, (2) to define and categorize current technology in non-invasive ECG recording and (3) to discuss desirable non-invasive recording features for personalized syncope evaluation to guide technological advancement and future studies. We performed a systematic review of literature that assessed non-invasive ECG monitoring devices, regardless the reason for monitoring. We performed an internet search and corresponded with syncope experts and companies to help identify further eligible products. We extracted information about included studies and device features. We found 173 relevant papers. The main reasons for ECG-monitoring were atrial fibrillation (n=45), coronary artery disease (n=10), syncope (n=8), palpitations (n=8), other cardiac diseases (n=67) and technological aspects of monitoring (n=35). We identified 198 devices: 5 hospital telemetry devices, 12 patches, 46 event recorders, 70 Holter monitors, 23 external loop recorders, 20 mobile cardiac outpatient telemetries and 22 multifunctional devices. The features of each device were very heterogeneous. There are a large number of ECG-monitoring devices with different features available on the market. Our findings may help clinicians select the appropriate device for their patients. Since there are only a few published articles analysing their usefulness in syncope patients, further research might improve their use in this clinical setting.