| Radar Doppler | Transmission-type microwave | |
|---|---|---|
| Frequency | 10 GHz or more | L band, 2.4 GHz |
| RR interval | Inaccurate | Exact |
| Aortic valve notch | Not visible | Visible |
| Heartbeat | Indirect, Vibration of the chest wall | Direct monitor, obtain flow wave (blood pressure) |
| Application | Human | Birds, human |