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125KHz cardreader mini-module is designed for reading code from 125KHz card compatible read-only tags and read/write card . It can be applied in office/home security, personal identification, access control, anti-forgery, interactive toy and production control systems etc. Support external antenna.Maximum effective distance up to 50mm . Less than 100ms decoding time.Uart interface . Support EM4100 compatible read only or read/write tags .