Radio-frequency identification (RFID) is the wireless non-contact use of radio-frequency electromagnetic fields to transfer data, for the purposes of automatically identifying and tracking tags attached to objects. The tags contain electronically stored information. This EM-18 RFID Reader is a Tiny, simple to use RFID reader module. With a built in antenna, the only holdup is the 2mm pin spacing. Power the module, hold up a card, and get a serial string output containing the unique ID of the card. It has TTL output.
 
Specifications and Features of EM-18 RFID Reader Module:-
 
Operating Voltage: 5V DC Supply
Reading Distance: 6-10 cm.
Read frequency: 125 kHz.
EM4001 64 – bit RFID tag compatible.
9600bps ASCII output.
Current : <50 mA
Operating Frequency : 125 Khz
Read Distance : 5 cm
Compatible Tags : 125KHz EM4100 Tags
Size : 32mm(length) * 32mm(width) * 8mm(height)