The common way of categorizing RFID tags is based on how they utilize power for communication between the reader and the tag.

Here’s an open source RFID cloner design that is about the same size as a standard RFID key card. It doesn’t need a battery to capture key codes, just the magnetic field generated by an RFID ...

Average cost for these is about $0.12 per tag in bulk. Active RFID tags, at costs ranging from $20 to more than $100 each, have their own power supply and broadcast their signals across longer ...