Classic 1k cards tags and stickers along with the Waspmote RFID/NFC module. More than 3.5 billions of this type of cards have been sold around the world up now. An RFID card has a thin form factor (81x54x1 mm), like a driving license or identification card, and can be kept in the user’s wallet. However, an RFID tag is smaller and thicker (around 20x20x5 mm) but can be kept in the user’s keyring. Last, an RFID sticker has an intermediate size (50×50) and it is really thin and flexible. Of course, a sticker can be stuck in any object so it focuses on the Internet of Things (IoT) and logistics applications.