1. Material:ABS 2. Frequency: 125 KHz 3. chip: Original AT MEL T5577 (The best rewritable chip) 4. Package included: 10pcs Red RFID keyfobs 5. Working Mode: Read-write modes - Can be used in 125KHz RFID card Copier/ Duplicator 6. Storage Capacity: 330 bit (264 free bit availability) 7. Reading distance is 0 - 10cm Package include: 10pcs T5577 RFID rewritable red 125KHZ Keyfobs

blue,black,yellow,red color available in stock. can write by 125KHz RFID writer/copier,NOT NFC CHIP,Can't work with NFC Phone. Please note it can't be read before you program the chip,it's original chip.can work before you write on it. it's rewritable chip,and it can write in 125khz id format and H ID WG 125khz format. Original T5577 Chip,it doesn't have pre-programmed id number,so need to write the id on it before you read.