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 times: > 100000 times Data storage: 10 years Antenna material: copper wire Diameter: 18mm/25mm/28mm or specify size Working temperature: -20℃~+70 ℃ (-4℉~+158℉)