Here’s a revised version of each line to avoid duplication:
These key fobs operate at a frequency of 13.56MHz. To integrate them with your locking system, confirm that it also supports the same 13.56MHz frequency; they will not work with 125kHz systems.
These fobs are read-only and cannot be rewritten; they come pre-programmed and cannot be altered using a card writer.
They are compatible with the MIFARE Classic 1K Card (M1 Card), meaning if your locking mechanism accepts M1 cards, these fobs will function correctly.
Ideal for RFID proximity access control systems and ID management, you can register these fobs as new keys for your RFID door locks if suitable.
Approximate dimensions of each fob are 1.58*1.26*0.18 inches. Made from ABS plastic, they come in black. The package contains 100 pieces.