Comply with protocol standards: ISO 18000-2 Chip: TK4100/EM4102/EM4305/T5577/T5567/T5577 Frequency: 125KHz Memory: read-only/512bit Read and write distance: 1~ 10cm (Depends on RF regulation in country of use, the reader antenna configuration, and the environmental conditions.) Erasable fotoana: > 100000 times Data storage: 10 years Antenna material: copper wire Diameter: 18mm/25mm/28mm or specify size Working temperature: -20℃ ~ + 70 ℃ (-4℉ ~ + 158 ℉)