RFID Reader Modules are an unfinished unit needing memory, a power supply, an antenna, a processor, and a case. The characteristics are type, frequency, interface, and package/case. The types are read or read/write with frequencies ranging from 125 kHz to 960 MHz and with an interface being Bluetooth, Ethernet, I2C, RS232, RS422, RS485, TTL, UART, or USB.