With an eID card reader, you can use your electronic identity card from home. Use the eID card reader, for example, to authenticate yourself on the internet or to place an electronic signature. Handy for when you deal with many banking and/or tax matters via the internet. Most eID readers read SD cards and SIM cards in addition to your ID card. For example, you can easily transfer all contacts from your SIM card to your computer. With an SD card reader, you have easy access to all your stored data, even if your computer or laptop doesn't have such a card reader. You only need a USB port.