5/20/50/100/ RFID 125KHz Proximity ID Identification Token Tag Key Keyfob EM4100
Chip:125KHZ EM4100. The EM4100 chip and the TK4100 chip is a kind of read-only applications, mainly used in the field of identification, the application range is very wide. Chip: EM4100. Working frequency: 125KHz.