Feature 1Practical Function: Read only, not writable. If you want to add these tags to your lock, please make sure your lock uses an unencrypted 125kHz frequency. 2Reliable Performance: Innovative technology carefully crafted, fine workmanship, wear resistant and waterproof, drop proof and not easy to break. 3Sensitive Induction: With intelligent chip, thickened copper wire, high sensitivity, high frequency, and has fast reading speed. 4Convenient to Use: This door lock key fobs is compact, lightweight, easy to carry and store, portable and simple to use. 5Wide Scope: Suitable for 125KHz proximity access control system and ID management system, suitable for community access control, checking attendance, parking lot.SpecificationItem Type: Door Lock Key FobMaterial: ABSSize: Approx. 25 x 35mm / 0.98 x 1.38inFrequency: 125KHzErase: Read Only .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List100 x DoorLockKeyFob