You need to connect a resistor 1K(1000ohm) 1/4Watt or 1.5K(1500ohm) 1/8 Watt other value in series when you use the function wires with LED to limit the current of led.

(Caution) DCC Voltages. Please make sure your DCC Voltages are less than 16V. We
recommend track voltage at 12V.

Mobile Decoder with Plux22 of 6 Functions

Interface: Plux22+ Blue and Black Wire
Scale: HO Scale
Size:16mm*17.5mm*3mm
Current Rating: 1A
Function: 6*100mA
Support to connect with 870009 KungFu stay alive kits
Max DCC Voltages: 16V
Suggest DCC Voltages: 12V