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ElecFreaks PlanetX RFID Module Uses radio frequency to read and write the recording media Connections: RJ11 4P4C Power: IIC Working voltage: 3.3 V Rated current: 50 mA The ElecFreaks PlanetX RFID Module uses radiofrequency to read and write the recording media (electronic tags or radiofrequency cards) to achieve the purpose of identifying targets and data exchange. You can use it to make an unmanaged parking lot.