<p>WRITABLE \u0026 REWRITABLE: It's rewritable chip, and it can write in 125khz id format and H ID WG 125khz format. Suitable for making new and back-up tags.</p> <p>FREQUENCY: 125kHz; Sensing Distance: 2.5 to 10 cm (1 to 4 inch); Data Storage Life: 10 Years.</p> <p>CHIPS: T5577 Chips, it doesn't have pre-programmed id number, so need to write the id on it before you read, so make sure you have the writer before you buy it.</p> <p>MATERIAL: High-Quality copper coil inside. Casing Material is ABS plastic. Waterproof \u0026 . Package includes 50Pcs.</p> <p>NOTE: You cannot add them to RFID locks directly. You must write data into them by a 125kHz RFID card writer before use. They are blank tags, no data inside. Can write by 125KHz RFID writer\/copier,CAN NOT WORK WITH ONITY SYSTEM and Proxmark3 RDV4.</p> <p>chip: T5577 (The best rewritable chip) </p> <p>Working Mode: Read-write modes - Can be used in 125KHz RFID card Copier\/ Duplicator</p> <p>Storage Capacity: 330 bit (264 free bit availability)</p> <p>Reading distance is 0 - 10cm</p> <p>Note: Please note it need to write the id on it before you read, it's chip.</p> <p>Colour:Black</p> <p>Material:plastic</p> <p>Package Contents:</p> <p>50 x Key Fob</p> <p>Only the above package content, other products are not included.</p> <p>Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.</p>