Note: These are 125kHz key fobs (tags). If you want to add them to your lock system, please ensure that your system uses the same frequency of unencrypted 125kHz. Incompatible with other frequencies like 13.56MHz. Incompatible with encrypted tags like HID, Indala, Cobra, APCiK, Paradox, Radio, Honeywell, Kaba, Isonas, etc. | Read only. Not rewritable. You cannot re-program them. Each key fob is already pre-programmed with a unique ID number. The 10-digit number is engraved on the tag casing. | Compatible with other universal 125kHz tags like EM4100/4102. | Suitable for 125kHz RFID proximity access control system and ID management system. For example, add it to your RFID door lock if applicable. | Approx. Size: 1.4*1.1*0.2 inch. Casing Material: ABS Plastic. Color: Blue. Package includes 100 PCS.

Important Note: These are blank tags without pre-programmed card numbers. You cannot directly add them to RFID locks or use a card reader to read them. Before use, you must first write data(card numbers) into them by a 125KHZ RFID card writer. More product info and FAQ is listed in the Product Description. Please read them before purchase. | Round-coin-shape sticker, with adhesive back. You can stick it on other stuff (but not metal) if necessary. | Frequency: 125kHz; Chip: ATMEL T5577 (compatible with other universal 125kHz tags); Sensing Distance: 2.5 to 10 cm (1 to 4 inch); Data Storage Life: 10 Years. | Writable & Rewritable. It can be erased and written 100,000 times. Suitable for making new and back-up tags. | Approx Size: 25mm Diameter, 1mm Thickness. Casing Material: White PVC Plastic. Waterproof & Durable. Package includes 10 PCS.

Note: Not re-writable. Read only. These are 125kHz key tags. If you want to add them to your lock system, please ensure that your system uses the same frequency of unencrypted 125kHz. Not compatible with other frequencies like 13.56MHz. Not compatible with encrypted tags like HID, Indala, Cobra, APCiK, Paradox, Radio, Honeywell, Kaba, Isonas, etc. | Read only. Not rewritable. You cannot re-program them. Each key fob is already pre-programmed with a unique ID number. | Compatible with other universal unencrypted 125kHz tags like EM4100/4102. | Suitable for 125kHz RFID proximity access control system and ID management system. For example, add it to your RFID door lock if applicable. | Round-coin-shape sticker, with adhesive back. You can stick it on other stuff (but not metal) if necessary. Approx Size: 25mm (1 inch) Diameter, 1mm Thickness. Casing Material: White PVC Plastic. Waterproof & Durable. Package includes 100 PCS.

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