Many many things about business card scanner
The more expensive it is, the more features it will have. When shopping for one, check to make sure it has an output format for the particular use you need it for. Does it have a feature to scan both sides? You can look for a portable scanner online or go to a local electronics store to buy one. Read reviews online about the portable scanner that you want to buy. When you buy online, make sure you know what the shipping prices are and what payment method the online stores use.