China Veterinary Ultrasonic Fetal Doppler (FD-2D), Find details about China Vital Signs Monitor, Vascular Doppler from Veterinary Ultrasonic Fetal Doppler (FD-2D)
| Functions | FD-2A | FD-2D | FD-2C | FD-2B | FD-2G |
| 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 |