Blue 100pcs/pack RFID 1356Mhz IC Keyfob Token Key Ring For Access Control Compatible with MIFARE Classic 1K Card _x000D_ _x000D_ RFID 13.56MHz IC : The RFID 13.56MHz IC ensures secure and fast access control. _x000D_ _x000D_ Compatible with classic 1K card : This keyfob token is compatible with the classic 1K card, making it easy to use. _x000D_ _x000D_ Pack of 100 : With a pack of 100, you'll have plenty of keyfobs for all your access control needs. _x000D_ _x000D_ CE Certified : This product is CE certified, ensuring its quality and safety. _x000D_ _x000D_ _x000D_ Feature Read only. Not re-writable. Each key fob is already pre-programmed. You cannot re-program them by a card writer. Compatible with MIFARE Classic 1K Card (M1 Card). If your lock uses M1 card, these key fobs can work for your lock. Suitable for 13.56MHz RFID proximity access control system and ID management system. For example, register them to your RFID door lock as new keys if applicable. Parameters: Frequency: 13.56MHz Chip: IC plug Approx. Fob size: 1.58*1.26*0.18 inch. Casing Material: ABS Plastic. Color: Blue. Package includes 100 PCS. Note: These are 13.56MHz key fobs (tags), according to ISO14443A. If you want to register them to your lock system, please ensure that your system uses the same frequency 13.56MHz. Incompatible with other frequencies like 125kHz. _x000D_ _x000D_