The RFID reader 1W-H0-04P MS reads identification data (UID) of transponders (cards, key fobs, etc.) contactlessly, compliant with ISO/IEC 14443-3-A (e.g. MIFARE cards), ISO/IEC 14443-3-B, ISO 15659, FeliCa, iClass, and ISO 18092 standards.
The device has a built-in single-color LED that can be used freely. The red LED must not be used for signaling failures or hazardous conditions.
The LED is powered by an internal voltage regulator through a built-in resistor. The LED turns on when the appropriate LED pin is connected to the negative (ground) of the power supply.