This snap on module is a 2-in-1 card reader that can read: Smart cards, UHF RFID tags of EPC Class 1 Gen2 ISO18000-63 standards. It comes in two models for different regions: US (902~928MHz) and EU (865~868MHz) The UHF antenna is located at the center of the module. The maximum reading distance is determined by the design and size of individual tags.