尺寸: 2.5×2.5cm Power supply: 2.7~5V@30mA Work frequency: 125KHz Support chip: ATA5557, T5567, T5577或兼容芯片 (默認格式曼徹斯特碼RF / 32) 接口: 串行端口 (TTL-232格式) 閱讀距離: <7厘米, 寫距離: <6厘米 (T5557, T5567, T5577 Chip R/W Module has read-only and read-write two models, according to the project needs to choose the right module.)