can't read before you write on it.need to write on it by the writer,it can write in ID and H ID format
rewritable chip
Description
1. Material:ABS
2. Frequency: 125 KHz
3. chip: Original AT MEL T5577 (The best rewritable chip)
4. Package included: 10pcs blue 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 125KHZ Keyfobs