Writable & Rewritable：They are empty RFID tags without data. They can repeatable reading and writing 100000 times. You need to write data to them for use. Compatible with RFID duplicators of 125kHz frequency | Features: Waterproof, dustproof, durable | Frequency /Chip: Frequency 125kHz, chip t5577, sensing distance 1-4 inches | Size /Package: Single size 1.4 * 1.1 * 0.2inch, package includes 10PCS | Material: The inner coil is made of high-quality pure copper, the shell material is ABS plastic, waterproof and durable, suitable for making new tags and spare tags

✅NOVEL DESIGN: 125KHz ID RFID card copier writer with handheld mini size design for easy operation. | ✅ADVANTAGES: Compatible with hid proximity card, RFID 125khz ID EM4100, T5577&T5577 card and keyfobs.Hid iCLASS card is not compatible. | ✅UNIQUE KEY-FOB : 2pcs Cool and funny sticky keyfob attached besides keyfob and blank card. | ✅ENERGY EFFICIENT: 20000 times with 2 batteries, low power consumption and long life. | ✅NOTE: Idteck, Keri pkt, hid indala, hid iCLASS, etc. are incompatible. If you are not sure whether the card you need to copy is compatible, PLEASE DON'T BUY. Please contact the seller's after-sales service for return and replacement.