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Features:
1,) 100% brand new and High quality,Waterproof,dustproof
2,) UID which can be changed 
3,)  Dual frequency,dual chip,compatible 125khz and 13.56mhz ISO14443A access control system
4,)  Readable and rewritable,No external power required
 
Specification:
Frequency:13.56MHz&125khz
Card chip:UID&T5577dual chip
Read/Write Time:1~2 ms
Rewitable:> 100,000 times
Data Retention:> 10 years
Material:PVC, PET, AL Inlay
Color:7 kind
Size:40*32*4.2MM   
Operating temperature: -20 degree to +85 degree