The starter kit, which includes 10 tags and a USB RFID reader, goes for about $40; a decent price considering the hacking potential for the RFID reader. In addition to using the reader ...

[Don] had some Serial RFID readers that he needed to work and be powered by USB. He went out and purchased a simple serial to USB converter, but was left with the problem of the operating voltage.

It can be connected through UART (TTL, RS232), USB, as well as Ethernet ... RFID Card/Smartphone Reader Module ELATEC T4MR-F TWN4 MultiTech HF/NFC Mini OEM RFID Card/Smartphone Reader Module ELATEC ...