100pcs 125KHz RFID Key Fob Proximity ID Card Token Tag Keypad Card for Door Entry Access Control System for Security Lock Wholesale, Read Only

Me encanto en servicio y la puntuliad a la hora de la entrega.

I've ordered several batches of these fobs from this seller, and the first few batches worked perfectly. However, after distributing them to patrons, we began experiencing access issues. Upon investigation, we discovered that the serial numbers on the fobs did not match what our badge scanner was reading.Further analysis revealed that these fobs do not conform to the standard Weigand 26-bit specification. In a typical 26-bit Weigand credential, the first and last bits are parity bits, and the middle 24 bits contain the card number. This setup allows for a maximum card number of 16,777,215. Some of these fobs, however, have card numbers exceeding this limit, which necessitates that a 25th bit (1st bit isn't being used as a parity bit, but instead a card number bit) be set to 1 instead of 0. This discrepancy is causing conflicts with other credentials, as the access control system is not recognizing these card numbers properly due to the incorrect parity bit settings.

Would not work

Didn't work for me, as I needed writeable units!

I have used several different types of fob, but for some reason these won’t work at all.