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Pocket Fetal Doppler Machine For Baby Heart Rate Measurement
| Ultrasound frequency | 2MHz |
| Ultrasound intensity | <10mW/cm2 |
| Power supply | DC Ni-Mh rechargeable battery |
| AC 220/110V, 50/60Hz | |
| Display | 45mm×25mm LCD |
| FHR Measuring range | 50~240bpm |
| FHR resolution | 1bpm |
| FHR accuracy | ±1bpm |
| Power consumption | <1W |
| Dimension | 135mm×95mm×35mm |
| Weight | 500g |
20 Series Difference Table
| Functions | 20A | 20D | 20C | 20B | 20G |
| Doppler type | Continuous | Continuous | Continuous | Continuous | Continuous |
| Display | No | B/W | Colour | B/W | Colour |
| Backlight | No | Yes | Yes | Yes | Yes |
| Build-in speaker | Yes | Yes | Yes | Yes | Yes |
| Various display modes | No | No | Yes | No | Yes |
| Volume adjust | Yes | Yes | Yes | Yes | Yes |
| Battery indicator | No | Yes | Yes | Yes | Yes |
| FHR display | No | Yes | Yes | Yes | Yes |
| FHR curve | No | No | Yes | No | Yes |
| Auto power off | No | Yes | Yes | Yes | Yes |
| Various work modes | No | Yes | Yes | Yes | Yes |
| Alkalinity battery | Yes | No | No | Yes | Yes |
| Ni-Mh battery | No | Yes | Yes | No | No |
| Charge in device | No | Yes | Yes | No | No |
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