Optional chip: EM4305, T5557, T5577, 5200 Frequency: 125KHz Storage Capacity: 512bit Size: 43×30×5mm or 50×30×5mm, Can customized Read and write distance: 2~10cm, depending on the reader and the application environment Working temperature: -20℃~+80℃ Materials: ABS Erasable times : >100,000 times Storage: 10 years Colors: red, green, blue, orange, yellow, white, optional