Writable & Rewritable: It can be erased and written 100,000 times. Suitable for making new and back-up tags, please use it with 125kHz RFID card writer/copier. | You cannot add them to RFID locks directly,it can't be read before you program the chip,it's original blank chip.Please write data into them by a 125KHz RFID card writer before use. They are blank tags, no data inside. | Can only be read and written by 125KHz RFID writer/copier,CAN NOT WORK WITH ONITY SYSTEM Proxmark3 RDV4 or other device. | Chip: ATMEL T5577 (compatible with other universal 125kHz tags). NOT NFC CHIP,Can't work with NFC Phone. | Frequency: 125kHz; Sensing Distance: 2.5 to 10 cm (1 to 4 inch); Data Storage Life: 10 Years.

Frequency: The rfid key cards is with 13.56MHZ ; Sensing Distance: 2.5 to 10 cm (1 to 4 inch); Data Storage Life: 10 Years. | Writable & Rewritable: The rewritable rfid tag can be erased and written 100,000 times. Suitable for making new and back-up tags, with the 13.56MHZ RFID card writer/copier. | Approx Size: 1.26*1.57*0.14 inch. High-Quality Copper Coil inside. Casing Material: ABS Plastic. Waterproof & Durable. Package includes 50 PCS. | Chip: ATMEL T5577 (compatible with other universal 13.56MHZ tags). | How to Use: You cannot add them to RFID locks directly. You must write data into them by a 13.56MHZ RFID card writer before use. They are blank tags, no data inside.

Convenient Access Control: RFID Key Fobs provide a convenient and secure way to control access to various systems and facilities. With these key fobs, users can easily gain entry to buildings, parking lots, or other restricted areas by simply waving or tapping the fob near a compatible reader. | Writable and Programmable: These RFID Key Fobs are writable, allowing for easy customization and programming. Users can assign specific access privileges or information to each fob, such as granting access to certain areas or linking it to a specific user profile. This flexibility makes them suitable for a wide range of access control systems. | Compatibility: The RFID Key Fobs are designed to be compatible with HID 125KHZ 26 Bit systems, including popular models like ISO-Prox 1346, 1386, 1326, and H10301. This ensures seamless integration with existing access control systems, making it easy to upgrade or replace existing key fobs without requiring significant changes to the infrastructure. | Sturdy and Long-Lasting: Constructed with high-quality materials, these RFID Key Fobs are built to withstand daily use and harsh environments. They are resistant to water, dust, and impact, ensuring their longevity and reliability. This durability makes them suitable for various industries, including commercial buildings, educational institutions, and industrial facilities. | Cost-Effective Solution: RFID Key Fobs offer a cost-effective solution for access control systems. Compared to traditional key-based systems, these fobs eliminate the need for physical keys, reducing the risk of loss or theft. Additionally, their reprogrammable nature allows for easy reassignment of access privileges, eliminating the need for costly rekeying or replacement of locks.