10pcs Quality Assurance EM ID CARD Read Only 4100 4102 reaction ID card 125KHZ RFID Card fit for Access Control Time Attendance

TK4100 / EM4100 RFID Card

It is widely used for door access control etc.

Each Card with an global unique UID number which is fixed not changed, so em4100 is read only, not for write or copy, if need for write or copy type keys, please have a see follow link products:
https://5yoa-sec.aliexpress.com/store/group/125khz-Rewritable-HID-EM4305-RFID/204435_510567022.html

Frequency: 125 KHz
Chip type: TK4100 / EM4100
Application: ID Identification, Logistics, VIP , E-payment, Access Control & Security, Loyalty System, Parking Management, Time Attendance, etc.