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| Functions | FD-200B | FD-200D | FD-200C | FD-200G |
|---|---|---|---|---|
| Doppler type | Continuous | Continuous | Continuous | Continuous |
| Display type | B/W | B/W | Colour | Colour |
| Build-in speaker | Yes | Yes | Yes | Yes |
| Battery indicator | Yes | Yes | Yes | Yes |
| Display | Digit | Digit | Digit+Curve | Digit+Curve |
| Various work modes | Yes | Yes | Yes | Yes |
| Battery | Alkalinity | Ni-MH | Ni-MH | Alkalinity |
| Charge in device | No | Yes | Yes | No |
Suffolk Medical