There are 3 types of scanners:
1. Flatbed scanner. You have flatbed scanner if the FeederPresent property returns False.
2. Scanner with flatbed and ADF. You have scanner with flatbed and ADF if the FeederPresent property returns True and the FeederEnabled property can be set to True and False.
3. ADF scanner. You have scanner with ADF only if the FeederPresent property returns True and the FeederEnabled property cannot be set to False.